Western African Ebola virus epidemic

Western African Ebola virus epidemic
	Simplified Ebola virus epidemic situation map
Date	December 2013 – June 2016[1][2]
Casualties

The Western African Ebola virus epidemic (2013–2016) was the most widespread outbreak of Ebola virus disease (EVD) in history—causing major loss of life and socioeconomic disruption in the region, mainly in Guinea, Liberia and Sierra Leone. The first cases were recorded in Guinea in December 2013; later, the disease spread to neighbouring Liberia and Sierra Leone,[12] with minor outbreaks occurring elsewhere. It caused significant mortality, with the case fatality rate reported which was initially considerable,[12][13][14][note 1] while the rate among hospitalised patients was 57–59%,[15] the final numbers 28,616 people, including 11,310 deaths, for a case-fatality rate of 40%.[16] Small outbreaks occurred in Nigeria and Mali,[17][18] and secondary infections of medical workers occurred in the United States and Spain.[19][20] In addition, isolated cases were recorded in Senegal,[21] the United Kingdom and Italy.[14][22] The number of cases peaked in October 2014 and then began to decline gradually, following the commitment of substantial international resources. As of 8 May 2016, the World Health Organization (WHO) and respective governments reported a total of 28,646 suspected cases and 11,323 deaths[23] (39.5%), though the WHO believes that this substantially understates the magnitude of the outbreak.[24][25]

On 8 August 2014, a Public Health Emergency of International Concern was declared[26] and on 29 March 2016, the WHO terminated the Public Health Emergency of International Concern status of the outbreak.[27][28][29] Subsequent flare-ups occurred; the last was declared over on 9 June 2016, 42 days after the last case tested negative on 28 April 2016 in Monrovia.[30]

The outbreak left about 17,000 survivors of the disease, many of whom report post-recovery symptoms termed post-Ebola syndrome, often severe enough to require medical care for months or even years. An additional cause for concern is the apparent ability of the virus to "hide" in a recovered survivor's body for an extended period of time and then become active months or years later, either in the same individual or in a sexual partner.[31] In December 2016, the WHO announced that a two-year trial of the rVSV-ZEBOV vaccine appeared to offer protection from the variant of EBOV responsible for the Western Africa outbreak. The vaccine is considered to be effective and is the only prophylactic which offers protection; hence, 300,000 doses have been stockpiled.[32][33] rVSV-ZEBOV received regulatory approval in 2019.[34][35]

Overview

Ebola virus disease (commonly known as "Ebola") was first described in 1976 in two simultaneous outbreaks in the Democratic Republic of the Congo and what is now South Sudan.[36] The 2013–2016 outbreak, caused by Ebola virus (EBOV)[37] was the first anywhere in the world to reach epidemic proportions. Previous outbreaks had been brought under control in a much shorter period of time. Extreme poverty, dysfunctional healthcare systems, distrust of government after years of armed conflict, and the delay in responding for several months, all contributed to the failure to control the epidemic. Other factors, per media reports, included local burial customs of washing the body and the unprecedented spread of Ebola to densely populated cities.[38][39][40][41][42]

Map showing death statistics as of 2014

As the outbreak progressed, the media reports, many hospitals, short on both staff and supplies, were overwhelmed and closed down, leading some health experts to state that the inability to treat other medical needs may have been causing "an additional death toll [that is] likely to exceed that of the outbreak itself".[43][44] Hospital workers, who worked closely with the highly contagious body fluids of the victims, were especially vulnerable to contracting the virus; in August 2014, the WHO reported that ten per cent of the dead had been healthcare workers.[45] In September 2014, it was estimated that the affected countries' capacity for treating Ebola patients was insufficient by the equivalent of 2,122 beds; however, by December 2014 there were enough beds to treat and isolate all reported cases, although the uneven distribution of cases was resulting in serious shortfalls in some areas.[46]

The WHO has been widely criticised for its delay in taking action to address the epidemic.[47] On 8 August 2014, it declared the outbreak a public health emergency of international concern.[48] By September 2014, Médecins Sans Frontières/Doctors Without Borders (MSF), the non-governmental organisation with the largest working presence in the affected countries, had grown increasingly critical of the international response. Speaking on 3 September, the International President of MSF spoke out concerning the lack of assistance from United Nations (UN) member countries: "Six months into the worst Ebola epidemic in history, the world is losing the battle to contain it."[49] In a 26 September statement, the WHO stated that "[t]he Ebola epidemic ravaging parts of Western Africa is the most severe acute public health emergency seen in modern times" and its Director-General called the outbreak "the largest, most complex and most severe we've ever seen".[50] In March 2015, the United Nations Development Group reported that due to a decrease in trade, closing of borders, flight cancellations, and drop in foreign investment and tourism activity fuelled by stigma, the epidemic had resulted in vast economic consequences in both the affected areas in Western Africa and even in other African nations with no cases of Ebola.[51]

On 28 January 2015, the WHO reported that for the first time since the week ending 29 June 2014, there had been fewer than 100 new confirmed cases reported in a week in the three most-affected countries. The response to the epidemic then moved to a second phase, as the focus shifted from slowing transmission to ending the epidemic.[52] On 8 April 2015, the WHO reported a total of only 30 confirmed cases,[53] and the weekly update for 29 July reported only seven new cases.[54] Cases continued to gradually dwindle and on 7 October 2015, all three of the most seriously affected countries, per media reports, recorded their first joint week without any new cases.[55] However, as of late 2015, while the large-scale epidemic had ended, according to media reports, sporadic new cases were still being recorded, frustrating hopes that the epidemic could be declared over.[56]

On 31 July 2015, the WHO announced "an extremely promising development" in the search for an effective vaccine for Ebola virus disease. While the vaccine had shown high efficacy in individuals, more conclusive evidence was needed regarding its capacity to protect populations through herd immunity.[57][58] In August 2015, after substantial progress in reducing the scale of the epidemic, the WHO held a meeting to work out a "Comprehensive care plan for Ebola survivors" and identify research needed to optimise clinical care and social well-being. Stating that "the Ebola outbreak has decimated families, health systems, economies, and social structures", the WHO called the aftermath of the epidemic "an emergency within an emergency." Of special concern is recent research that shows some Ebola survivors experience a so-called "post-Ebola Syndrome", with symptoms so severe that survivors may require medical care for months and even years.[59][60] As the main epidemic was coming to an end in December 2015, the UN announced that 22,000 children had lost one or both parents to Ebola.[61] On 29 March 2016, the Director-General of WHO terminated the Public Health Emergency of International Concern status of the Western African Ebola virus epidemic.[27]

Epidemiology

Outbreak

Ebola outbreak worldwide

Widespread outbreak

Limited outbreak

Isolated cases

Medically evacuated cases

It is generally believed that a one or two-year-old boy,[62][63] later identified as Emile Ouamouno, who died in December 2013 in the village of Méliandou, Guéckédou Prefecture, Guinea, was the index case of the Western African epidemic.[64] Scientists have deduced that bats are involved in the spread of the virus,[65] and, incidentally, the boy's home was in the vicinity of a large colony of Angolan free-tailed bats, according to media reports.[66] His mother, sister, and grandmother, per media reports later became ill with similar symptoms and also died; people infected by these initial cases spread the disease to other villages.[67][68] There was knowledge of Tai Forest virus in Côte d'Ivoire, which had resulted in one human transmission in 1994. Thus, these early cases were diagnosed as other conditions more common to the area and the disease had several months to spread before it became recognised as Ebola.[64][67]

Monthly aggregate Ebola cases in the Western Africa epidemic 2014–15

Monthly aggregate Ebola deaths in the Western Africa epidemic 2014–15

On 25 March 2014, the WHO indicated that Guinea's Ministry of Health had reported an outbreak of Ebola virus disease in four southeastern districts, and that suspected cases in the neighbouring countries of Liberia and Sierra Leone were being investigated. In Guinea, a total of 86 suspected cases, including 59 deaths, had been reported as of 24 March.[69] By late May, the outbreak had spread to Conakry, Guinea's capital—a city of about two million people.[69] On 28 May, the total number of reported cases had reached 281, with 186 deaths.[69]

In Liberia, the disease was reported in four counties by mid-April 2014 and cases in Liberia's capital Monrovia were reported in mid-June.[70] The outbreak then spread to Sierra Leone and progressed rapidly. By 17 July, the total number of suspected cases in the country stood at 442, surpassing those in Guinea and Liberia.[71] By 20 July, additional cases of the disease had been reported by the media in the Bo District, while the first case in Freetown, Sierra Leone's capital, was reported in late July.[72][73]

As the epidemic progressed, a small outbreak occurred in Nigeria that resulted in 20 cases and another in Mali with 7 cases. Four other countries (Senegal, Spain, the United Kingdom and the United States of America) also reported cases imported from Western Africa, with widespread and intense transmission.[74][75][76]

On 31 March 2015, one year after the first report of the outbreak, the total number of cases was in excess of 25,000—with over 10,000 deaths.[77]

As the epidemic waned, following international control efforts, the edition of 8 April 2015 of the WHO's Ebola Situation Reports stated that a total of 30 cases were reported[78] and in 29 July 2015, the WHO weekly update reported only 7 cases—the lowest in more than a year.[54] In October 2015, the WHO recorded its first week without any new cases,[55] and while the large-scale epidemic appeared to have ended by late 2015, sporadic new cases continued to be reported.[56][79]

On 14 January 2016, after all the previously infected countries had been declared Ebola-free, the WHO reported that "all known chains of transmission have been stopped in Western Africa", but cautioned that further small outbreaks of the disease could occur in the future.[80] The following day, Sierra Leone confirmed its first new case since September 2015.[29]

Countries that experienced widespread transmission

Outbreak distribution map affected part of Western Africa (17 December 2014)

Guinea

On 25 March 2014, the WHO reported an outbreak of Ebola virus disease in four southeastern districts of Guinea with a total of 86 suspected cases, including 59 deaths, and MSF assisted the Ministry of Health by establishing Ebola treatment centres in the epicentre of the outbreak.[69] On 31 March, the U.S. Centers for Disease Control and Prevention (CDC) sent a five-person team to assist in the response to the outbreak.[69] Thinking that spread of the virus had been contained, MSF closed its treatment centres in May, leaving only a skeleton staff to handle the Macenta region. However, in late August, according to media reports, large numbers of new cases reappeared in the region.[81]

In February 2015, media reported that Guinea recorded a rise in cases for the second week in a row,[82] health authorities stated that this was related to the fact that they "were only now gaining access to faraway villages", where violence had previously prevented them from entering.[83] On 14 February, violence erupted and an Ebola treatment centre near the centre of the country was destroyed. Guinean Red Cross teams said they had suffered an average of 10 attacks a month over the previous year;[84] MSF reported that acceptance of Ebola education remained low and that further violence against their workers might force them to leave.[85]

Resistance to interventions by health officials among the Guinean population remained greater than in Sierra Leone and Liberia, per media reports, raising concerns over its impact on ongoing efforts to halt the epidemic; in mid-March, there were 95 new cases and on 28 March, and a 45-day "health emergency" was declared in 5 regions of the country.[85][86] On 22 May, the WHO reported another rise in cases, per media reports,[87] which was believed to have been due to funeral transmissions;[88] on 25 May, six persons were placed in prison isolation after they were found travelling with the corpse of an individual who had died of the disease,[89] on 1 June, it was reported that violent protests in a north Guinean town at the border with Guinea-Bissau had caused the Red Cross to withdraw its workers.[90]

In late June 2015, the WHO reported that "weekly case incidence has stalled at between 20 and 27 cases since the end of May, whilst cases continue to arise from unknown sources of infection, and to be detected only after post-mortem testing of community deaths".[91] On 29 July, a sharp decline in cases was reported,[54] with only a single case, per media reports left by the end of the week,[92] the number of cases eventually plateaued at 1 or 2 cases per week after the beginning of August.[93] On 28 October, an additional 3 cases were reported in the Forécariah Prefecture by the WHO.[94] On 6 November, a media report indicated Tana village to be the last known place with Ebola in the country,[95] and on 11 November, WHO indicated that no Ebola cases were reported in Guinea; this was the first time since the epidemic began, that no cases had been reported in any country.[96] On 15 November, the last quarantined individuals were released, per media reports[97] and on 17 November, the last Ebola patient in Guinea—a 3-week-old baby—had recovered; the 42-day countdown toward the country being declared Ebola-free started on 17 November, the day after the patient yielded a second consecutive negative blood test.[98][99][100] The patient was discharged from the hospital on 28 November, per media reports[101] on 29 December 2015, upon expiration of the 42-day waiting period, the WHO declared Guinea Ebola-free.[102]

On 17 March 2016, the government of Guinea reported, per the media, that 2 people had again tested positive for Ebola virus in Korokpara,[103] it was also reported that they were from the village where members of one family had recently died from vomiting (and diarrhea).[104] On 19 March, it was also reported by the media that another individual had died due to the virus at the treatment centre in Nzerekore,[105] consequently, the country's government quarantined an area around the home where the cases took place.[106] On 22 March, the media reported that medical authorities in Guinea had quarantined 816 suspected contacts of the prior cases (more than 100 individuals were considered high-risk);[107][108] the same day, Liberia ordered its border with Guinea closed.[109] Macenta Prefecture, 200 kilometres (120 mi) from Korokpara, registered Guinea's fifth fatality due to Ebola virus disease within the same period.[110] On 29 March, it was reported that about 1,000 contacts had been identified (142 of them high-risk),[27] and on 30 March 3 more confirmed cases were reported from the sub-prefecture of Koropara.[111] On 1 April, it was reported by the media, that possible contacts, which numbered in the hundreds, had been vaccinated with an experimental vaccine using a ring vaccination approach.[112][113]

On 5 April 2016, it was reported via the media, that there had been 9 new cases of Ebola since the virus resurfaced, out of which 8 were fatal;[114] on 1 June, after the stipulated waiting period, the WHO again declared Guinea Ebola-free,[115] after which the country entered a 90-day period of heightened surveillance that was concluded on 30 August 2016.

In September 2016, findings were published suggesting that the resurgence in Guinea was caused by an Ebola survivor who, after eight months of abstinence, had sexual relations with several partners, including the first victim in the new outbreak.[116][117] The disease was also spread to Liberia by a woman who went there after her husband had died of Ebola.[118]

Sierra Leone

Kenema Hospital, Sierra Leone

The first person reported infected in Sierra Leone, according to media reports, was a tribal healer who had been treating Ebola patients from across the nearby border with Guinea and who died on 26 May 2014; according to tribal tradition, her body was washed for burial, and this appears to have led to infections in women from neighbouring towns.[119] On 11 June Sierra Leone shut its borders for trade with Guinea and Liberia and closed some schools in an attempt to slow the spread of the virus;[120] on 30 July the government began to deploy troops to enforce quarantines,[121] and by 15 October the last district in Sierra Leone previously untouched by the disease had declared Ebola cases.[122]

During the first week of November reports told of a worsening situation due to intense transmission in Freetown. According to the Disaster Emergency Committee, food shortages resulting from aggressive quarantines were making the situation worse,[123] and on 4 November media reported that thousands had violated quarantine in search of food in the town of Kenema.[124] With the number of cases continuing to increase, an MSF coordinator described the situation in Sierra Leone as "catastrophic", saying, "there are several villages and communities that have been basically wiped out ... Whole communities have disappeared but many of them are not in the statistics."[125] In mid-November the WHO reported that, while there was some evidence that the number of cases were no longer rising in Guinea and Liberia, steep increases persisted in Sierra Leone.[74]

Ebola crisis: More UK aid arrives in Sierra Leone

On 9 December 2014 news reports described the discovery of "a grim scene"—piles of bodies, overwhelmed medical personnel and exhausted burial teams—in the remote eastern Kono District.[126] On 15 December the CDC indicated that their main concern was Sierra Leone, where the epidemic had shown no signs of abating as cases continued to rise exponentially; by the second week of December, Sierra Leone had reported nearly 400 cases—more than three times the number reported by Guinea and Liberia combined. According to the CDC, "the risk we face now [is] that Ebola will simmer along, become native and be a problem for Africa and the world, for years to come".[127] On 17 December President Koroma of Sierra Leone launched "Operation Western Area Surge" and workers went door-to-door in the capital city looking for possible cases.[128][129] The operation led to a surge in reports of cases, with 403 new ones reported between 14 and 17 December.[128][130]

According to the 21 January 2015 WHO Situation Report, the case incidence was rapidly decreasing in Sierra Leone.[131][132][133] However, in February and March reports indicated a rise again in the number of cases.[134][135][136][137] The following month, the 5 April WHO report again disclosed a downward trend[138] and the WHO weekly update for 29 July reported a total of only 3 new cases, the lowest in more than a year.[54] On 17 August the country marked its first week with no new cases,[139] and one week later the last patients were released.[140] However, a new case emerged on 1 September, when a patient from Sella Kafta village in Kambia District tested positive for the disease after her death;[141] her case eventually resulted in 3 other infections among her contacts.[142]

On 14 September 2015 Sierra Leone's National Ebola Response Centre confirmed the death of a 16-year-old in a village in the Bombali District.[143] It is suspected that she contracted the disease from the semen of an Ebola survivor who had been discharged in March 2015.[144] On 27 September a new 42-day countdown began to declare the country Ebola-free,[145] which eventually occurred on 7 November 2015; thereafter, the country increased its vigilance on the Guinean border.[146][147]

Sierra Leone had entered a 90-day period of enhanced surveillance that was scheduled to end on 5 February 2016, when, on 14 January, a new Ebola death was reported in the Tonkolili District.[148][149] Prior to this case, the WHO had advised that "we still anticipate more flare-ups and must be prepared for them. A massive effort is underway to ensure robust prevention, surveillance and response capacity across all three countries by the end of March."[150] On 16 January aid workers reported that a woman had died of the virus and that she may have exposed several individuals; the government later announced that 100 people had been quarantined.[151] Investigations indicated that the deceased was a female student from Lunsar, in Port Loko District, who had gone to Kambia District on 28 December 2015 before returning symptomatic. She had also visited Bombali District to consult a herbalist, and had later gone to a government hospital in Magburaka. The WHO indicated that there were 109 contacts (28 of them high-risk), that there were another 3 missing contacts, and that the source or route of transmission that caused the fatality was unknown.[152] A second new case—confirmed by WHO spokesman Tarik Jasarevic to involve a 38-year-old relative and caregiver of the aforementioned Ebola victim—had become symptomatic on 20 Jan while under observation at a quarantine centre.[153][154] On 22 January it was reported that this patient was responding to treatment.[155] On 26 January WHO Director-General, Dr Margaret Chan officially confirmed that the outbreak was not yet over;[29] that same day, it was also reported that Ebola restrictions had halted market activity in Kambia District amid protests.[156] On 7 February 70 individuals were released from quarantine,[157] and on 8 February the last Ebola patient was also released.[158] On 17 February the WHO indicated that 2,600 Ebola survivors had accessed health assessments and eye examinations.[159]

On 4 February 2016 the last known case tested negative for a second consecutive time and Sierra Leone commenced another 42-day countdown towards being declared Ebola-free.[160][161] On 17 March 2016 the WHO announced that the Sierra Leone flare-up was over, and that no other chains of transmission were known to be active at that time.[162] The media reported that Sierra Leone then entered a 90-day period of heightened surveillance, which concluded on 15 June 2016, and it was reported that by 15 July the country had discontinued testing corpses for the virus.[163]

Liberia

An Ebola treatment unit in Liberia

In Liberia, the disease was reported in both Lofa and Nimba counties in late March 2014.[164] On 27 July, President Ellen Johnson Sirleaf announced that Liberia would close its borders, with the exception of a few crossing points such as Roberts International Airport, where screening centres would be established.[165] Schools and universities were closed,[166][167] and the worst-affected areas in the country were placed under quarantine.[168]

With only 50 physicians in the entire country—one for every 70,000 citizens—Liberia was already in a healthcare crisis.[169] In September, the CDC reported that some hospitals had been abandoned, while those still functioning lacked basic facilities and supplies.[170] In October, the Liberian ambassador in Washington was reported as saying that he feared that his country may be "close to collapse";[169] by 24 October, all 15 counties had reported Ebola cases.[6][171]

By November 2014, the rate of new infections in Liberia appeared to be declining and the state of emergency was lifted. The drop in cases was believed to be related to an integrated strategy combining isolation and treatment with community behaviour change, including safe burial practices, case finding and contact tracing.[172][173] Roselyn Nugba-Ballah, leader of the Safe & Diginified Burial Practices Team during the crisis, was awarded the Florence Nightingale Medal in 2017 for her work during the crisis.[174]

In January 2015, the MSF field coordinator reported that Liberia was down to only 5 confirmed cases.[175] In March, after two weeks of not reporting any new cases, 3 new cases were confirmed.[176] On 8 April, a new health minister was named in an effort to end Ebola in the country and on 26 April, MSF handed the Ebola treatment facility, ELWA-3, over to the government.[177] On 30 April, the US shut down a special Ebola treatment unit in Liberia.[178] The last known case of Ebola died on 27 March,[179] and the country was officially declared Ebola-free on 9 May 2015, after 42 days without any further cases being recorded. The WHO congratulated Liberia saying, "reaching this milestone is a testament to the strong leadership and coordination of Liberian President Ellen Johnson Sirleaf and the Liberian Government, the determination and vigilance of Liberian communities, the extensive support of global partners, and the tireless and heroic work of local and international health teams."[180] As at May 2015, the country remained on high alert against recurrence of the disease.[181][182][183]

After three months with no new reports of cases, on 29 June Liberia reported that the body of a 17-year-old boy, who had been treated for malaria, tested positive for Ebola. The WHO said the boy had been in close contact with at least 200 people,[184] who they were following up, and that "the case reportedly had no recent history of travel, contact with visitors from affected areas, or funeral attendance." A second case was confirmed on 1 July.[185][186] After a third new case was confirmed on 2 July, and it was discovered that all 3 new cases had shared a meal of dog meat, researchers looked at the possibility that the meat may have been involved in the transfer of the virus.[187][188] Testing of the dog's remains, however, was negative for the Ebola virus.[189] By 9 July 3 more cases were discovered, bringing the total number of new cases to 5, all from the same area.[190] On 14 July, a woman died of the disease in the county of Montserrado, bringing the total to 6.[191] On 20 July, the last patients were discharged,[192] and on 3 September 2015, Liberia was declared Ebola-free again.[193]

After two months of being Ebola-free, a new case was confirmed on 20 November 2015, when a 15-year-old boy was diagnosed with the virus[194][195] and two family members subsequently tested positive as well.[196][197] Health officials were concerned because the child had not recently travelled or been exposed to someone with Ebola and the WHO stated that "we believe that this is probably again, somehow, someone who has come in contact with a virus that had been persisting in an individual, who had suffered the disease months ago." Two staff of the CDC were sent to the country to help ascertain the cause of the new cases.[198] The infected boy died on 24 November,[199] and on 3 December 2 remaining cases were released after recovering from the disease.[200] The 42-day countdown toward Liberia being declared Ebola-free, for the third time, started on 4 December 2015.[201] On 16 December, the WHO reaffirmed that the cases in Liberia were the result of re-emergence of the virus in a previously infected person,[202] and there was speculation that the boy may have been infected by an individual who became infectious once more due to pregnancy, which may have weakened her immune system.[203] On 18 December, the WHO indicated that it still considered Ebola in Western Africa a public health emergency, though progress had been made.[204]

After having completed the 42-day time period, Liberia was declared free from the virus on 14 January 2016, effectively ending the outbreak that had started in neighbouring Guinea 2 years earlier. Liberia began a 90-day period of heightened surveillance, scheduled to conclude on 13 April 2016,[205] but on 1 April, it was reported that a new Ebola fatality had occurred,[206] and on 3 April, a second case was reported in Monrovia.[207] On 4 April, it was reported that 84 individuals were under observation due to contact with the 2 confirmed Ebola cases.[208] By 7 April, Liberia had confirmed 3 new cases since the virus resurfaced and a total of 97 contacts, including 15 healthcare workers, were being monitored.[209] The index case of the new flareup was reported to be the wife of a patient who died from Ebola in Guinea; she had travelled to Monrovia after the funeral but succumbed to the disease.[210] The outbreak in Guinea, in turn, had begun when a man, who had survived Ebola, had sexual intercourse with a woman and passed the virus to her, even though he had recovered more than a year earlier.[116][117]

On 29 April, WHO reported that Liberia had discharged the last patient and had begun the 42-day countdown to be declared Ebola-free once more. According to the WHO, tests indicated that the flare-up was likely due to contact with a prior Ebola survivor's infected body fluids.[118] On 9 June, the flare-up was declared over, and the country Ebola-free, due to the passage of the 42-day period;[211][212] Liberia then entered a 90-day period of heightened surveillance, which ended on 7 September 2016. In early July 2016, a trial for males with detectable Ebola RNA in semen, started.[213]

Western African countries with limited local cases

Senegal

In March 2014, the Senegal Ministry of Interior closed its southern border with Guinea,[214] but on 29 August, the health minister announced the country's first case – a university student from Guinea who was being treated in a Dakar hospital.[215] The patient was a native of Guinea who had travelled to Dakar, arriving on 20 August. On 23 August, he sought medical care for symptoms including diarrhoea, and vomiting plus signs of fever. He received treatment for malaria but did not improve and left the facility. Still experiencing the same symptoms, on 26 August he was referred to a specialised facility for infectious diseases, and subsequently hospitalised.[215]

On 28 August 2014, authorities in Guinea issued an alert informing their medical services and neighbouring countries that a person who had been in close contact with an Ebola-infected patient had escaped their surveillance system. The alert prompted testing for Ebola at the Dakar laboratory, and the positive result launched an investigation, triggering urgent contact tracing.[215] On 10 September, it was reported that the student had recovered but health officials continued to monitor his contacts for 21 days.[216] No further cases were reported,[217] and on 17 October 2014, the WHO officially declared that the outbreak in Senegal had ended.[6]

The WHO officially commended the Senegalese government, and in particular the President Macky Sall and the Minister of Health, Dr Awa Coll-Seck, for their response in quickly isolating the patient and tracing and following up 74 contacts, as well as for their public awareness campaign. This acknowledgement was also extended to MSF and the CDC for their assistance.[218]

Nigeria

The first case in Nigeria was a Liberian-American, who flew from Liberia to Nigeria's most populated city of Lagos on 20 July 2014. On 6 August 2014, the Nigerian health minister told reporters that one of the nurses that attended to the Liberian had died from the disease. 5 newly confirmed cases were being treated at an isolation ward.[219]

On 22 September 2014, the Nigerian health ministry announced, "As of today, there is no case of Ebola in Nigeria." According to the WHO, 20 cases and 8 deaths were confirmed, including the imported case, who also died. 4 of the dead were health workers who had cared for the index case.[220]

The WHO's representative in Nigeria officially declared the country Ebola-free on 20 October 2014, after no new active cases were reported in the follow up contacts, stating it was a "spectacular success story".[221] Nigeria was the first African country to be declared Ebola free.[222] This was largely due to the early quarantine efforts of Dr. Ameyo Stella Adadevoh at First Consultants Medical Centre in Lagos.[223]

Mali

Malian regions with Ebola cases (Kayes/Bamako), November 2014

On 23 October 2014, the first case of Ebola virus disease in Mali was confirmed in the city of Kayes—a two-year-old girl who had arrived with a family group from Guinea, and died the next day.[224][225] Her father had worked for the Red Cross in Guinea and also in a private health clinic; he had died earlier in the month, likely from an Ebola infection contracted in the private clinic. It was later established that a number of family members had also died of Ebola. The family had returned to Mali after the father's funeral via public bus and taxi—a journey of more than 1,200 kilometres (750 mi). All contacts were followed for 21 days, with no further spread of the disease reported.[226]

On 12 November 2014, Mali reported deaths from Ebola in an outbreak unconnected with the first case in Kayes. The first probable case was an imam who had fallen ill on 17 October in Guinea and was transferred to the Pasteur Clinic in Mali's capital city, Bamako, for treatment. He was treated for kidney failure but was not tested for Ebola; he died on 27 October and his body returned to Guinea for burial.[227] A nurse and a doctor who had treated the imam subsequently fell ill with Ebola and died.[228][229] The next 3 cases were related to the imam as well: a man who had visited the imam while he was in hospital, his wife and his son. On 22 November, the final case related to the imam was reported—a friend of the Pasteur Clinic nurse who had died from the Ebola virus.[230] On 12 December, the last case in treatment recovered and was discharged, "so there are no more people sick with Ebola in Mali", according to a Ministry of Health source.[231] On 16 December, Mali released the final 13 individuals who were being quarantined[232] and 24 days later (18 January 2015) without new cases, the country was declared Ebola-free.[17]

Other countries with limited local cases

United Kingdom

On 29 December 2014, Pauline Cafferkey, a British aid worker who had just returned to Glasgow from Sierra Leone, was diagnosed with Ebola.[233] She was treated and declared to be free of infection and released from hospital on 24 January 2015.[10][234] On 8 October, she was readmitted for complications caused by the virus[235] and was in "serious" condition, according to a hospital report. On 14 October, her condition was listed as "critical"[236] and 58 individuals were being monitored and 25 received an experimental vaccination, being close contacts.[237][238] On 21 October, it was reported that she had been diagnosed with meningitis caused by the virus persisting in her brain.[239] On 12 November, she was released from hospital after making a full recovery.[240] However, on 23 February, Ms. Cafferkey was admitted for a third time, "under routine monitoring by the Infectious Diseases Unit ... for further investigations", according to a spokesperson.[241][242]

Italy

On 12 May 2015, it was reported that a nurse, who had been working in Sierra Leone, had been diagnosed with Ebola after returning home to the Italian island of Sardinia. He was treated at Spallanzani Hospital, the national reference centre for Ebola patients.[243] On 10 June, it was reported that he had recovered and was disease-free and he was released from hospital.[244]

Spain

On 5 August 2014, the Brothers Hospitallers of Saint John of God confirmed that Brother Miguel Pajares, who had been volunteering in Liberia, had become infected. He was evacuated to Spain and died on 12 August.[245] On 21 September it was announced that Brother Manuel García Viejo, another Spanish citizen who was medical director at the San Juan de Dios Hospital in Lunsar, had been evacuated to Spain from Sierra Leone after being infected with the virus. His death was announced on 25 September.[246]

In October 2014, a nursing assistant, Teresa Romero, who had cared for these patients became unwell and on 6 October tested positive for Ebola,[247][248] making this the first confirmed case of Ebola transmission outside of Africa. On 19 October, it was reported that Romero had recovered, and on 2 December the WHO declared Spain Ebola-free following the passage of 42 days since Teresa Romero was found to be cured.[249]

United States

On 30 September 2014, the CDC declared its first case of Ebola virus disease. It disclosed that Thomas Eric Duncan became infected in Liberia and travelled to Dallas, Texas on 20 September. On 26 September, he fell ill and sought medical treatment, but was sent home with antibiotics. He returned to the hospital by ambulance on 28 September and was placed in isolation and tested for Ebola.[250][251] He died on 8 October.[252] Two cases stemmed from Duncan, when two nurses that had treated him tested positive for the virus on 10 and 14 October[253][254] and ended when they were declared Ebola-free on 24 and 22 October, respectively.[255][256]

A fourth case was identified on 23 October 2014, when Craig Spencer, an American physician who had returned to the United States after treating Ebola patients in Western Africa, tested positive for the virus.[257] This case, however, had no relation to those originating from Duncan. Spencer recovered and was released from hospital on 11 November.[258]

Countries with medically evacuated cases

A number of people who had become infected with Ebola were medically evacuated for treatment in isolation wards in Europe or the US. They were mostly health workers with one of the NGOs in Western Africa. With the exception of a single isolated case in Spain, no secondary infections occurred as a result of the medical evacuations. The US accepted four evacuees and three were flown to Germany.[259][260][261] France,[262][263] Italy,[264] the Netherlands,[265] Norway,[266][267] Switzerland,[268] and the United Kingdom received two patients (and five who were exposed).[269][270]

Unrelated outbreak in the Democratic Republic of the Congo

In August 2014, the WHO reported an outbreak of Ebola virus in the Boende District, part of the northern Équateur province of the Democratic Republic of the Congo (DRC), where 13 people were reported to have died of Ebola-like symptoms.[271] Genetic sequencing revealed that this outbreak was caused by the Zaire Ebola species, which is native to the DRC; there have been seven previous Ebola outbreaks in the country since 1976. The virology results and epidemiological findings indicated no connection to the epidemic in Western Africa.[271][272]

The index case was initially reported to have been a woman from Ikanamongo Village, who became ill with symptoms of Ebola after she had butchered a bush animal.[271][273] However, later findings suggested that there may have been several previous cases, and it was reported that pigs in the village may have been infected with Ebola some time before the first human case occurred.[274] The WHO declared the outbreak over on 21 November 2014, after a total of 66 cases and 49 deaths.[275][276]

Virology

Ebola virus particles using electron micrograph

Ebola virus disease is caused by four of five viruses classified in the genus Ebolavirus. Of the four disease-causing viruses, Ebola virus (formerly and often still called the Zaire Ebola virus) is dangerous and is the virus responsible for the epidemic in Western Africa.[277][278] Since the discovery of the viruses in 1976, when outbreaks occurred in South Sudan (then Sudan) and Democratic Republic of the Congo (then Zaire), Ebola virus disease had been confined to areas in Middle Africa, where it is native. With the current outbreak, it was initially thought that a new species native to Guinea might be the cause, rather than being imported from Middle to Western Africa.[64] However, further studies have shown that the outbreak was likely caused by an Ebola virus lineage that spread from Middle Africa via an animal host within the last decade, with the first viral transfer to humans in Guinea.[277][279]

In a study done by Tulane University, the Broad Institute and Harvard University, in partnership with the Sierra Leone Ministry of Health and Sanitation, researchers provided information about the origin and transmission of the Ebola virus that set the Western African outbreak apart from previous ones, including 341 genetic changes in the virion.[277] Five members of the research team became ill and died from Ebola before the study was published in August 2014.[277]

Ebola virus particles

In a report released in August 2014, researchers tracked the spread of Ebola in Sierra Leone from the group first infected—13 women who had attended the funeral of the traditional healer, where they contracted the disease—giving them a unique opportunity to track how the virus had changed. This provided "the first time that the real evolution of the Ebola virus [could] be observed in humans." The research showed that the outbreak in Sierra Leone was sparked by at least two distinct lineages introduced from Guinea at about the same time. It is not clear whether the traditional healer was infected with both variants, or if perhaps one of the women attending the funeral was independently infected. As the Sierra Leone epidemic progressed, one virus lineage disappeared from patient samples, while a third one appeared.[280][281][282][283]

In January 2015, the media stated researchers in Guinea had reported mutations in the virus samples that they were looking at. According to them, "we've now seen several cases that don't have any symptoms at all, asymptomatic cases. These people may be the people who can spread the virus better, but we still don't know that yet. A virus can change itself to [become] less deadly, but more contagious and that's something we are afraid of."[284] A 2015 study suggested that accelerating the rate of mutation of the Ebola virus could make the virus less capable of infecting humans. In this animal study, the virus became practically non-viable, consequently increasing survival.[285]

Transmission

Animal to human transmission

The life cycles of the Ebolavirus

The initial infection is believed to occur after an Ebola virus is transmitted to a human by contact with an infected animal's body fluids. Evidence strongly implicates bats as the reservoir hosts for ebolaviruses (however, despite considerable research, infectious ebolaviruses have never been recovered from bats).[286][287] Bats drop partially eaten fruit and pulp, then land mammals such as gorillas and duikers feed on this fallen fruit. This chain of events forms a possible indirect means of transmission from the natural host to animal populations.[288] As primates in the area were not found to be infected and fruit bats do not live near the location of the initial zoonotic transmission event in Meliandou, Guinea, it is suspected that the index case occurred after a child had contact with an insectivorous bat from a colony of Angolan free-tailed bats near the village.[289]

On 12 January, the journal Nature reported that the virus emergence could be found by studying how bush-meat hunters interacted with the ecosystem.[290] The continent of Africa has experienced deforestation in several areas or regions; this may contribute to recent outbreaks, including this EVD epidemic, as initial cases have been in the proximity of deforested lands where fruit-eating bats natural habitat may be affected, though 100% evidence does not as yet exist.[291][292]

Human to human transmission

Prior to this outbreak, it was believed that human-to-human transmission occurred only via direct contact with blood or bodily fluids from an infected person who is showing symptoms of infection, by contact with the body of a person who had died of Ebola, or by contact with objects recently contaminated with the body fluids of an actively ill infected person.[293][294] It is now known that the Ebola virus can be transmitted sexually. Over time, studies have suggested that the virus can persist in seminal fluid, with a study released in September 2016 suggesting that the virus may survive more than 530 days after infection.[117] EBOV RNA in semen is not the same situation as perseverance of EBOV in semen, however the "clinical significance of low levels of virus RNA in convalescent" individuals who are healthy is unknown.[295][296]

In September 2014, the WHO had reported: "No formal evidence exists of sexual transmission, but sexual transmission from convalescent patients cannot be ruled out. There is evidence that live Ebola virus can be isolated in seminal fluids of convalescent men for 82 days after onset of symptoms. Evidence is not available yet beyond 82 days."[297] In April 2015, following a report that the RNA virus had been detected in a semen sample six months after a man's recovery, the WHO issued a statement: "For greater security and prevention of other sexually transmitted infections, Ebola survivors should consider correct and consistent use of condoms for all sexual acts beyond three months until more information is available."[298][299]

The WHO based their new recommendations on a March 2015 case, in which a Liberian woman who had no contact with the disease other than having had unprotected sex with a man who had had the disease in October 2014, was diagnosed with Ebola. While no evidence of the virus was found in his blood, his semen revealed Ebola virus RNA closely matching the variant that infected the woman. However, "doctors don't know if there was any fully formed (and therefore infectious) virus in the guy's semen." It is known that testes are protected from the body's immune system to protect the developing sperm, and it is thought that this same protection may allow the virus to survive in the testes for an unknown time.[300]

On 14 September 2015, the body of a girl who had died in Sierra Leone tested positive for Ebola[143] and it was suspected that she may have contracted the disease from the semen of an Ebola survivor who was discharged in March 2015.[144] According to some news reports, a new study to be published in the New England Journal of Medicine indicated that the RNA virus could remain in the semen of survivors for up to six months,[301][302] and according to other researchers, the RNA virus could continue in semen for 82 days and maybe longer. Furthermore, Ebola RNA had been found up to 284 days post-onset of viral symptoms.[303]

Containment difficulties

One of the primary reasons for the spread of the disease is the low-quality, functioning health systems in the parts of Africa where the disease occurs.[304] The risk of transmission is increased among those caring for people infected. Recommended measures when caring for those who are infected include medical isolation via the proper use of boots, gowns, gloves, masks and goggles, and sterilizing all equipment and surfaces.[305]

One of the biggest dangers of infection faced by medical staff requires their learning how to properly suit up and remove personal protective equipment. Full training for wearing protective body clothing can take 10 to 14 days.[306] Even with proper isolation equipment available, working conditions such as lack of running water, climate control, and flooring have made direct care difficult. Two American health workers who contracted the disease and later recovered said that to the best of their knowledge, their team of workers had been following "to the letter all of the protocols for safety that were developed by the [CDC] and WHO", including a full body coverall, several layers of gloves, and face protection including goggles. One of the two, a physician, had worked with patients, but the other was assisting workers to get in and out of their protective gear while wearing protective gear herself.[307]

Difficulties in attempting to halt transmission have also included the multiple disease outbreaks across country borders.[308] Dr Peter Piot, the scientist who co-discovered the Ebola virus, stated that the outbreak was not following its usual linear patterns as mapped out in earlier outbreaks—this time the virus was "hopping" all over the Western African epidemic region.[81] Furthermore, most past epidemics had occurred in remote regions, but this outbreak spread to large urban areas, which had increased the number of contacts an infected person might have and made transmission harder to track and break.[309] On 9 December, a study indicated that a single individual introduced the virus into Liberia, causing the most cases of the disease in that country.[310]

Containment and control

Nigerian doctors training on PPE by WHO

In August 2014, the WHO published a road map of the steps required to bring the epidemic under control and to prevent further transmission of the disease within Western Africa; the coordinated international response worked towards realising this plan.[311]

Surveillance and contact tracing

Contact tracing is an essential method of preventing the spread of the disease, this requires effective community surveillance so that a possible case of Ebola can be registered and accurately diagnosed as soon as possible, and subsequently finding everyone who has had close contact with the case and tracking them for 21 days. However, this requires careful record-keeping by properly trained and equipped staff.[312][313] WHO Assistant Director-General for Global Health Security, Keiji Fukuda, said on 3 September 2014, "We don't have enough health workers, doctors, nurses, drivers, and contact tracers to handle the increasing number of cases."[314] There was a massive effort to train volunteers and health workers, sponsored by United States Agency for International Development (USAID).[315] According to WHO reports, 25,926 contacts from Guinea, 35,183 from Liberia and 104,454 from Sierra Leone were listed and traced as of 23 November 2014.[75] According to one study, it is important to have a public awareness campaign to inform the affected community about the importance of contact tracing, so that true information can be obtained from the community.[316]

Community awareness

To reduce the spread, the WHO recommended raising community awareness of the risk factors for Ebola infection and the protective measures individuals can take.[317] These include avoiding contact with infected people and regular hand washing using soap and water.[318] A condition of extreme poverty exists in many of the areas that experienced a high incidence of infections. According to the director of the NGO Plan International in Guinea, "The poor living conditions and lack of water and sanitation in most districts of Conakry pose a serious risk that the epidemic escalates into a crisis. People do not think to wash their hands when they do not have enough water to drink."[319] One study showed that once people had heard of the Ebola virus disease, hand washing with soap and water improved, though socio-demographic factors influenced hygiene.[320]

A number of organisations enrolled local people to conduct public awareness campaigns among the communities in Western Africa.[321] "... what we mean by social mobilization is to try to convey the right messages, in terms of prevention measures, adapted to the local context—adapted to the cultural practices in a specific area," said Vincent Martin, FAO's representative in Senegal.[322]

Denial in some affected countries also made containment efforts difficult.[323] Language barriers and the appearance of medical teams in protective suits sometimes increased fears of the virus.[324] In Liberia, a mob attacked an Ebola isolation centre, stealing equipment and "freeing" patients while shouting "There's no Ebola."[325] Red Cross staff were forced to suspend operations in southeast Guinea after they were threatened by a group of men armed with knives.[326] In September, in the town of Womey in Guinea, suspicious inhabitants wielding machetes murdered at least eight aid workers and dumped their bodies in a latrine.[327]

An August 2014 study found that nearly two-thirds of Ebola cases in Guinea were believed to be due to burial practices including washing of the body of one who had died.[40][41][42][62][72][328] In November, WHO released a protocol for the safe and dignified burial of people who die from Ebola virus disease. It encouraged the inclusion of family and clergy, and gave specific instructions for Muslim and Christian burials.[329] In the 21 January 2015 WHO road map update, it was reported that 100% of districts in Sierra Leone and 71% of districts in Guinea had a list of key religious leaders who promoted safe and dignified burials.[330] Speaking on 27 January 2015, Guinea's Grand Imam, the country's highest cleric, gave a very strong message saying, "There is nothing in the Koran that says you must wash, kiss or hold your dead loved ones," and he called on citizens to do more to stop the virus by practising safer burying rituals that do not compromise tradition.[331]

During the height of the epidemic, most schools in the three most affected countries were shut down and remained closed for several months. During the period of closure UNICEF and its partners established strict hygiene protocols to be used when the schools were reopened in January 2015. They met with thousands of teachers and administrators to work out hygiene guidelines. Their efforts included installing hand-washing stations and distributing millions of bars of soap and chlorine and plans for taking the temperature of children and staff at the school gate. Their efforts were complicated by the fact that less than 50% of the schools in these three countries had access to running water. In August 2015, UNICEF released a report that stated, "Across the three countries, there have been no reported cases of a student or teacher being infected at a school since strict hygiene protocols were introduced when classes resumed at the beginning of the year after a months-long delay caused by the virus."[332] Researchers presented evidence indicating that infected people that lived in low socioeconomic areas were more likely to transmit the virus to other socioeconomic status (SES) communities, in contrast to individuals in higher SES areas who were infected as well.[333] Another study showed that, in Guinea, a satisfactory knowledge had not altered the level of comprehensive knowledge about the virus. As a consequence, the high level of misinterpretation was responsible for a low comprehensive knowledge about the virus; 82% of individuals believed that Ebola was the result of a virus (36.2% thought that a higher power had caused it).[334] A study on Nigeria's success story stated that, in this case, a prompt response by the government and proactive public health measures had resulted in the quick control of the outbreak.[335]

During the height of the crisis, Wikipedia's Ebola page received 2.5 million page views per day, making Wikipedia one of the world's most highly used sources of trusted medical information regarding the disease.[336][337]

Travel restrictions and quarantines

Quarantine travel pass for individuals providing assistance

There was serious concern that the disease would spread further within Western Africa or elsewhere in the world, such as:

Western Africa On 8 August 2014, a cordon sanitaire, a disease-fighting practice that forcibly isolates affected regions, was established in the triangular area where Guinea, Liberia, and Sierra Leone are separated only by porous borders and where 70 per cent of the known cases had been found.[338] This was subsequently replaced by a series of simple checkpoints for hand-washing and measuring body temperature on major roads throughout the region, manned either by local volunteers or by the military.[339][340]
International Many countries considered imposing travel restrictions to or from the region. On 2 September 2014, WHO Director-General Margaret Chan advised against this, saying that they were not justified and that they would prevent medical experts from entering the affected areas. She also stated that they were "marginalizing the affected population and potentially worsening the crisis". UN officials working on the ground also criticised the travel restrictions, saying the solution was "not in travel restrictions but in ensuring that effective preventive and curative health measures are put in place".[341] MSF also spoke out against the closure of international borders, calling them "another layer of collective irresponsibility" and added: "The international community must ensure that those who try to contain the outbreak can enter and leave the affected countries if need be."[49]

In December 2015, during the 8th meeting of WHO's "IHR Emergency Committee regarding Ebola", it spoke out against further travel restrictions saying: "The Committee remains deeply concerned that 34 countries still enact inappropriate travel and transport measures and highlights the need to immediately terminate any such measures due to their negative impact, particularly on recovery efforts."[342] In December 2015, the CDC indicated that it would no longer make the recommendation for US citizens going to Sierra Leone to be extra careful. However, the CDC did further indicate that individuals travelling to the country should take precaution with sick people and body fluids. Additionally, individuals travelling to the country should avoid contact with animals.[343]

Returning health workers There was concern that people returning from affected countries, such as health workers and reporters, may have been incubating the disease and become infectious after arriving. Guidelines for returning workers were issued by a number of agencies, including the CDC,[344] MSF,[345] Public Health England,[346] and Public Health Ontario.[347]

Treatment

Practising taking blood in PPE

No proven Ebola virus-specific treatment presently exists;[348][349] however, measures can be taken to improve a patient's chances of survival.[350] Ebola symptoms may begin as early as two days or as long as 21 days after one is exposed to the virus. Symptoms usually begin with a sudden influenza-like illness characterised by feeling tired, and pain in the muscles and joints. Later symptoms may include headache, nausea, and abdominal pain; this is often followed by severe vomiting and diarrhoea.[351][352] In past outbreaks, it has been noted that some patients bleed internally and/or externally; however data published in October 2014 showed that this had been a rare symptom in the Western African outbreak.[353] Another study published in October 2014 suggested that a person's genetic makeup may play a major role in determining how an infected person's body reacts to the disease, with some infected people experiencing mild or no symptoms while others progress to a very severe stage that includes bleeding.[354]

Without fluid replacement, such an extreme loss of fluids leads to dehydration, which in turn may lead to hypovolaemic shock—a condition in which there isn't enough blood for the heart to pump through the body. If a patient is alert and is not vomiting, oral rehydration therapy may be instituted, but patients who are vomiting or are delirious must be hydrated with intravenous (IV) therapy.[348] [355] However, administration of IV fluids is difficult in the African environment. Inserting an IV needle while wearing three pairs of gloves and goggles that may be fogged is difficult, and once in place, the IV site and line must be constantly monitored. Without sufficient staff to care for patients, needles may become dislodged or pulled out by a delirious patient. A patient's electrolytes must be closely monitored to determine correct fluid administration, for which many areas did not have access to the required laboratory services.[356]

Treatment centres were overflowing with patients while others waited to be admitted; dead patients were so numerous that it was difficult to arrange for safe burials. Based on many years of experience in Africa—and several months working in the present epidemic—MSF took a conservative approach. While using IV treatment for as many patients as they could manage, they argued that improperly managed IV treatment was not helpful and may even kill a patient when not properly managed. They also said that they were concerned about further risk to already overworked staff.[356] While experts have studied the mortality rates of different treatment settings, and given the wide differences in variables that affected outcomes, adequate information had not yet been gathered to make a definitive statement about what constituted optimal care in the Western African setting.[357] Paul Farmer of Partners in Health, an NGO that only as of January 2015 had begun to treat Ebola patients, strongly supported IV therapy for all Ebola patients stating: "What if the fatality rate isn't the virulence of disease but the mediocrity of the medical delivery?" Farmer suggested that every treatment facility should have a team that specialises in inserting IVs, or better yet, peripherally inserted central catheter lines.[356]

Prognosis

Ebola virus disease has a high case fatality rate (CFR), which in past outbreaks varied between 25% and 90%, with an average of about 50%.[358] The epidemic caused significant mortality, with reported CFRs of up to 70%.[12][13][14][15] Care settings that have access to medical expertise may increase survival by providing good maintenance of hydration, circulatory volume, and blood pressure.[353]

The disease affects males and females equally and the majority of those that contract Ebola disease are between 15 and 45 years of age.[12] For those over 45 years, a fatal outcome was more likely in the Western African epidemic, as was also noted in preceding outbreaks.[353] Only rarely do pregnant women survive—a midwife who worked with MSF in a Sierra Leone treatment centre stated that she knew of "no reported cases of pregnant mothers and unborn babies surviving Ebola in Sierra Leone."[359] In September 2015, the WHO issued pregnancy guidance information entitled, "Interim Guidance on Ebola Virus Disease in Pregnancy."[360]

It has been suggested that the loss of human life was not limited to Ebola victims alone. Many hospitals had to shut down, leaving people with other medical needs without care. A spokesperson for the UK-based health foundation, the Wellcome Trust, said in October 2014 that "the additional death toll from malaria and other diseases [is] likely to exceed that of the outbreak itself".[43] Dr Paul Farmer stated: "Most of Ebola's victims may well be dying from other causes: women in childbirth, children from diarrhoea, people in road accidents or from trauma of other sorts."[44] As the epidemic drew to a close in 2015, a report from Sierra Leone showed that the fear and mistrust of hospitals generated by the epidemic had resulted in an 11% decline in facility-based births, and that those receiving care before or after birth fell by about a fifth. Consequently, between May 2014 and April 2015, the deaths of women during or just after childbirth rose by almost a third and those of newborns by a quarter, compared to the previous year.[361]

Research suggests that many Ebola infections are asymptomatic, meaning that some infected people show no symptoms of the disease. For example, two studies done on previous outbreaks showed that 71% of seropositive individuals did not have the clinical disease in one outbreak and another study reported that 46% of asymptomatic close contacts of patients with Ebola were seropositive.[362] On 22 January, the WHO issued Clinical Care for survivors of Ebola Virus Disease: interim guidance. The guidance covers specific issues like musculoskeletal pain, which is reported in up to 75% of survivors. The pain is symmetrical and more pronounced in the morning, with the larger joints most affected. There is also possible periarticular tenosynovitis affecting the shoulders. The WHO guidelines advise to distinguish non-inflammatory arthralgia from inflammatory arthritis. With regard to ocular problems, sensitivity to light and blurry vision have been indicated among survivors. Among the aftereffects of Ebola virus disease, uveitis and optic nerve disease could appear after an individual is discharged. Ocular problems could threaten sight in survivors, thus the need for prompt treatment. In treating such individuals, the WHO recommends urgent intervention if uveitis is suspected; this consists mainly of prednisone (a corticosteroid). Hearing loss has been reported in Ebola survivors 25% of the time. Treatment, in the case of acute labyrinthitis (inner ear disorder), should be given within 10 days of the onset of symptoms and prochlorperazine, a vestibular sedative, may be administered for vertigo.[363]

Post-Ebola virus syndrome

There are at least 17,000 people who have survived infection from the Ebola virus in Western Africa; some of them have reported lingering health effects.[364] In early November, a WHO consultant reported: "Many of the survivors are discharged with the so-called Post-Ebola Syndrome. We want to ascertain whether these medical conditions are due to the disease itself, the treatment given or chlorine used during disinfection of the patients. This is a new area for research; little is known about the post-Ebola symptoms."[365][366]

In February 2015, a Sierra Leone physician said about half of the recovered patients she saw reported declining health and that she had seen survivors go blind.[367][368] In May 2015, a senior consultant to the WHO said that the reports of eye problems were especially worrying because "there are hardly any ophthalmologists in Western Africa, and only they have the skills and equipment to diagnose conditions like uveitis that affect the inner chambers of the eye."[369]

The medical director of a hospital in Liberia reported that he was seeing health problems in patients who had been in recovery for as long as nine months. Problems he was seeing included chronic pain, sometimes so severe that walking was difficult; eye problems, including uveitis; and headaches as the most common physical symptoms. "They're still very severe and impacting their life every day. These patients will need medical care for months and maybe years." A physician from the Kenema hospital in Sierra Leone reported similar health difficulties.[369]

In December 2014, a British aid worker who had just returned from Sierra Leone was diagnosed with Ebola. She was treated with survivors' blood plasma and experimental drugs and declared free of disease in January 2015. However, in October 2015, she again became critically ill and was diagnosed with meningitis. In this unprecedented case it is thought that the virus remained in her brain replicating at a very low level until it had replicated to a degree capable of causing clinical meningitis. The woman was treated and in November 2015 it was reported that she had recovered.[239][240]

In terms of medical literature that are reviews, few articles have been published, such as Shantha, et al. which discusses management of panuveitis and iris heterochromia.[370]

Ebola survivor studies

An observational study, done roughly 29 months after the 2007 Bundibugyo outbreak in Uganda, found that long-term sequelae (i.e. consequences) persisted among survivors. Symptoms included eye pain, blurred vision, hearing loss, difficulty swallowing, difficulty sleeping, arthralgias, memory loss or confusion, and "various constitutional symptoms controlling for age and sex".[362]

From August through December 2014, a total of 10 patients with Ebola were treated in US hospitals; of these patients, 8 survived. In March 2015, the CDC interviewed the survivors; they all reported having had at least one adverse symptom during their recovery period. The symptoms ranged from mild (e.g. hair loss) to more severe complications requiring re-hospitalisation or treatment. The most frequently reported symptoms were lethargy or fatigue, joint pain, and hair loss. Sixty-three per cent reported having eye problems including two who were diagnosed with uveitis, 75% reported psychological or cognitive symptoms, and 38% reported neural difficulties. Although most symptoms resolved or improved over time, only one survivor reported complete resolution of all symptoms.[371]

A study published in May 2015 discussed the case of Ian Crozier, a Zimbabwe-born physician and American citizen who became infected with Ebola while he was working at an Ebola treatment centre in Sierra Leone. He was transported to the US and successfully treated at Emory University Hospital. However, after discharge Crozier began to experience symptoms including low back pain, bilateral enthesitis of the Achilles tendon, paresthesias involving his lower legs, and eye pain, which was diagnosed as uveitis. His eye condition worsened and a specimen of aqueous humor obtained from his eye tested positive for Ebola. The authors of the study concluded that "further studies to investigate the mechanisms responsible for the ocular persistence of Ebola and the possible presence of the virus in other immune-privileged sites (e.g., in the central nervous system, gonads, and articular cartilage) are warranted." The authors also noted that 40% of participants in a survey of 85 Ebola survivors in Sierra Leone reported having "eye problems", though the incidence of actual uveitis was unknown.[372]

Another study, which was released in August 2015 looked at the health difficulties reported by survivors. Calling the set of symptoms "post-Ebolavirus disease syndrome", the research found symptoms that included "chronic joint and muscle pain, fatigue, anorexia, hearing loss, blurred vision, headache, sleep disturbances, low mood and short-term memory problems", and suggested the "implementation of specialised health services to treat and follow-up survivors".[364]

Level of care

WHO workers gear up to go to Ebola ward Nigeria, 2014

In June 2014, it was reported that local authorities did not have the resources to contain the disease, with health centres closing and hospitals becoming overwhelmed.[373] There were also reports that adequate personal protection equipment was not being provided for medical personnel.[374] The Director-General of MSF said: "Countries affected to date simply do not have the capacity to manage an outbreak of this size and complexity on their own. I urge the international community to provide this support on the most urgent basis possible."[308]

In late August, MSF called the situation "chaotic" and the medical response "inadequate." They reported that they had expanded their operations, but couldn't keep up with the rapidly increasing need for assistance, which had forced them to reduce the level of care: "It is not currently possible, for example, to administer intravenous treatments." Calling the situation "an emergency within the emergency", MSF reported that many hospitals had shut down due to lack of staff or fears of the virus among patients and staff, which had left people with other health problems without any care at all. Speaking from a remote region, an MSF worker said that a shortage of protective equipment was making the medical management of the disease difficult and that they had limited capacity to safely bury bodies.[375]

By September, treatment for Ebola patients had become unavailable in some areas. Speaking on 12 September, WHO Director-General, Margaret Chan, said: "In the three hardest hit countries, Guinea, Liberia and Sierra Leone, the number of new cases is moving far faster than the capacity to manage them in the Ebola-specific treatment centres. Today, there is not one single bed available for the treatment of an Ebola patient in the entire country of Liberia."[376] According to a WHO report released on 19 September, Sierra Leone was meeting only 35% of its need for patient beds, while for Liberia it was just 20%.[377]

In early December, the WHO reported that at a national level there were enough beds in treatment facilities to treat and isolate all reported Ebola cases, although their uneven distribution was resulting in serious shortfalls in some areas. Similarly, all affected countries had sufficient and widespread capacity to bury reported deaths; however, because not all deaths were reported, it was possible that the reverse could have been the case in some areas. WHO also reported that every district had access to a laboratory to confirm cases of Ebola within 24 hours of sample collection, and that all three countries had reported that more than 80% of registered contacts associated with known cases of Ebola virus disease were being traced, although contact tracing was still a challenge in areas of intense transmission and those with community resistance.[46]

Healthcare settings

Kerry Town Ebola Treatment Centre in Sierra Leone MOD 45158320.jpg at the International Gymnastics Federation

A number of Ebola Treatment Centres were set up in the area, supported by international aid organisations and staffed by a combination of local and international staff. Each treatment centre is divided into a number of distinct and rigorously separate areas. For patients, there is a triage area, and low- and high-risk care wards. For staff, there are areas for preparation and decontamination. An important part of each centre is an arrangement for safe burial or cremation of bodies, required to prevent further infection.[378][379] In January 2015, a new treatment and research centre was built by Rusal and Russia in the city of Kindia in Guinea. It is one of the most modern medical centres in Guinea.[380][381] Also in January, MSF admitted its first patients to a new treatment centre in Kissy, an Ebola hotspot on the outskirts of Freetown, Sierra Leone. The centre has a maternity unit for pregnant women with the virus.[382][383]

Although the WHO does not advise caring for Ebola patients at home, in some cases it became a necessity when no hospital treatment beds were available. For those being treated at home, the WHO advised informing the local public health authority and acquiring appropriate training and equipment.[384][385] UNICEF, USAID and Samaritan's Purse began to take measures to provide support for families that were forced to care for patients at home by supplying caregiver kits intended for interim home-based interventions. The kits included protective clothing, hydration items, medicines, and disinfectant, among other items.[386][387] Even where hospital beds were available, it was debated whether conventional hospitals are the best place to care for Ebola patients, as the risk of spreading the infection is high.[388] In October, the WHO and non-profit partners launched a program in Liberia to move infected people out of their homes into ad hoc centres that could provide rudimentary care.[389] Health facilities with low-quality systems for preventing infection were involved as sites of amplification during viral outbreaks.[390]

Protective clothing

The Ebola epidemic caused an increasing demand for protective clothing. A full set of protective clothing includes a suit, goggles, a mask, socks and boots, and an apron. Boots and aprons can be disinfected and reused, but everything else must be destroyed after use. Health workers change garments frequently, discarding gear that has barely been used. This not only takes a great deal of time but also exposes them to the virus because, for those wearing protective clothing, one of the most dangerous moments for contracting Ebola is while suits are being removed.[391]

The protective clothing sets that MSF uses cost about $75 apiece. Staff who have returned from deployments to Western Africa say the clothing is so heavy that it can be worn for only about 40 minutes at a stretch. A physician working in Sierra Leone has said: "After about 30 or 40 minutes, your goggles have fogged up; your socks are completely drenched in sweat. You're just walking in water in your boots. And at that point, you have to exit for your own safety ... Here it takes 20–25 minutes to take off a protective suit and must be done with two trained supervisors who watch every step in a military manner to ensure no mistakes are made, because a slip up can easily occur and of course can be fatal."[306][392] By October, there were reports that protective outfits were beginning to be in short supply and manufacturers began to increase their production,[393] but the need to find better types of suits has also been raised.[394]

USAID published an open competitive bidding for proposals that address the challenge of developing "... new practical and cost-effective solutions to improve infection treatment and control that can be rapidly deployed; 1) to help health care workers provide better care and 2) transform our ability to combat Ebola".[395][396][397] On 12 December 2014, USAID announced the result of the first selection in a press release.[398]

On 17 December 2014, a team at Johns Hopkins University developed a prototype breakaway hazmat suit, and was awarded a grant from the USAID to develop it. The prototype has a small, battery-powered cooling pack on the worker's belt. "You'll have air blowing out that is room temperature but it's 0% humidity ... the Ebola worker is going to feel cold and will be able to function inside the suit without having to change the suit so frequently", said one source.[399] In March, Google developed a tablet that could be cleaned with chlorine; it is charged wirelessly and can transmit information to servers outside the working area.[400][401]

The WHO recommends the use of 2 pairs of gloves, with the outer pair worn over the gown. Using 2 pairs may reduce the risk of sharp injuries; however, there is no evidence that using more than the recommended will give additional protection. WHO also recommends the use of a coverall, which is generally appraised in terms of its resistance to non-enveloped DNA virus. When a gown (or coverall) is worn, it should continue beyond the shoe covers.[402] According to guidelines released by the CDC in August 2015, updates were put in place to improve the PAPR doffing method to make the steps easier, and affirm the importance of cleaning the floor where doffing has been done. Additionally, a designated doffing assistant was recommended to help in this process. The order in which boot covers are removed, by these guidelines, indicates their removal after the coverall or gown. Finally, a trained observer is to read to the healthcare worker each step in donning and doffing, but must not physically assist therein.[403]

CDC staff preparing to enter ETU in Liberia

Healthcare workers

In the hardest hit areas there have historically been only one or two doctors available to treat 100,000 people, and these doctors are heavily concentrated in urban areas.[309] Ebola patients' healthcare providers, as well as family and friends, are at highest risk of getting infected because they are more likely to come in direct contact with their blood or body fluids. In some places affected by the outbreak, care may have been provided in clinics with limited resources, and workers could be in these areas for several hours with a number of Ebola infected patients.[404] According to the WHO, the high proportion of infected medical staff could be explained by a lack of adequate manpower to manage such a large outbreak, shortages of protective equipment or improper use of what was available, and "the compassion that causes medical staff to work in isolation wards far beyond the number of hours recommended as safe".[309] In August 2014, healthcare workers represented nearly 10 per cent of cases and fatalities—significantly impairing the capacity to respond to an outbreak in an area already facing severe shortages.[405] By 1 July 2015, the WHO reported that a total of 874 health workers had been infected, of which 509 had died.[406]

Among the fatalities was Samuel Brisbane, a former adviser to the Liberian Ministry of Health and Social Welfare, described as "one of Liberia's most high-profile doctors".[407] In July 2014, leading Ebola doctor Sheik Umar Khan from Sierra Leone also died in the outbreak.[119][408][409] In August, a well-known Nigerian physician, Ameyo Adadevoh, died.[410] Mbalu Fonnie, a licensed nurse-midwife and nursing supervisor at the Kenema hospital in Sierra Leone, with over 30 years of experience, died after contracting Ebola while caring for a fellow nurse who was pregnant and had the disease. Fonnie was also a co-author of a study that analysed the genetics of the Ebola virus; five others contracted Ebola and died while working on the same study.[411]

Basing their choice on "the person or persons who most affected the news and our lives, for good or ill, and embodied what was important about the year", the editors of Time magazine in December 2014 named the Ebola health workers as Person of the Year. Editor Nancy Gibbs said: "The rest of the world can sleep at night because a group of men and women are willing to stand and fight. For tireless acts of courage and mercy, for buying the world time to boost its defences, for risking, for persisting, for sacrificing and saving, the Ebola fighters are Time's 2014 Person of the Year."[412] According to an October 2015 report by the CDC, Guinean healthcare workers had 42.2 times higher Ebola infection rates than non-healthcare workers, and male healthcare workers were more affected than their female counterparts. The report indicated that 27% of Ebola infections among healthcare workers in Guinea occurred among doctors. The CDC report also stated that the Guinea Ministry of Health recorded males as representing 46% of the health workforce, and that 67% of Ebola infections among non-doctor healthcare workers occurred among males. The CDC further indicated that healthcare workers in Guinea were less likely to report contact with an infected individual than non-healthcare workers.[413]

Experimental treatments and testing

Researcher working on Ebola virus

There is as yet no known confirmed medication or treatment for Ebola virus disease. The director of the US National Institute of Allergy and Infectious Diseases has stated that the scientific community is still in the early stages of understanding how infection with the Ebola virus can be treated and prevented.[414][415] A number of experimental treatments are undergoing clinical trials.[416][417][418] During the epidemic some patients received experimental blood transfusions from Ebola survivors, but a later study found that the treatment did not provide significant benefit.[419]

The effectiveness of potential treatments for any disease is usually assessed in a randomised controlled trial, which compares the outcome of those who received treatment to those who received a placebo (i.e. dummy treatment). However, randomised controlled trials are considered unethical when a disease is frequently fatal, as is the case with Ebola. In December 2015, a study was released that found that the viral load found in a patient's blood in the week after the onset of symptoms is a strong indication of the patient's likelihood to die or survive the disease. The researchers suggested that this information could help to assess the efficacy of proposed treatments more accurately in non-randomised clinical trials.[420]

Ebola control is hindered by the fact that current diagnostic tests require specialised equipment and highly trained personnel. Since there are few suitable testing centres in Western Africa, this delays diagnosis. As of February 2015 a number of rapid diagnostic tests were under trial.[421] In September 2015, a new chip-based testing method that can detect Ebola accurately was reported. This new device allows for the use of portable instruments that can provide immediate diagnosis.[422][423]

Vaccines

Several Ebola vaccine candidates had been developed in the decade prior to 2014 and had been shown to protect nonhuman primates against infection, but none had yet been approved for clinical use in humans.[424][425][426][427] According to a 2015 review article, about 15 different vaccines were in preclinical stages of development, including DNA vaccines, virus-like particles and viral vectors.[428] and another seven as yet unheard-of vaccines were being developed. Additionally, there were two phase III studies being conducted with two different vaccines. .[428]

In July 2015, researchers announced that a vaccine trial in Guinea had been completed that appeared to give protection from the virus. The vaccine, rVSV-ZEBOV,[429] had shown high efficacy in individuals, but more conclusive evidence was needed regarding its capacity to protect populations through "herd immunity" . The vaccine trial employed "ring vaccination", a technique that was also used in the 1970s to eradicate smallpox, in which health workers control an outbreak by vaccinating all suspected infected individuals within the surrounding area.[57][58][430][431]

In December 2016, the results of the two-year Guinea trial were published announcing that rVSV-ZEBOV had been found to protect people who had been exposed to cases of Ebola.[32] Of the nearly 6,000 people vaccinated, none had contracted Ebola after a ten-day period while in the group not vaccinated 23 cases developed. In addition to showing high efficacy among those vaccinated, the trial also showed that unvaccinated people were indirectly protected from Ebola virus through the ring vaccination approach, termed "herd immunity". The vaccine has not yet had regulatory approval, but it is considered to be so effective that 300,000 doses have already been stockpiled. Researchers have found the results "quite encouraging [but] there is still a lot more work to be done on vaccines for Ebola." Not yet known is the length of time that a vaccination will be effective and whether it will prove effective for the Sudan virus rather than only EBOV, which is responsible for the Western Africa outbreak.[33][432] In April 2018 rVSV-ZEBOV Ebola vaccine was used to stop an outbreak for the first time, the 2018 Équateur province Democratic Republic of the Congo Ebola virus outbreak, with 3,481 people vaccinated.[433] rVSV-ZEBOV received regulatory approval in 2019.[34][35]

Outlook

From the beginning of the outbreak, there existed considerable difficulty in getting reliable estimates—both of the number of people affected and of its geographical extent.[434] The three most affected countries—Guinea, Liberia and Sierra Leone—are among the poorest in the world, with extremely low levels of literacy, few hospitals or doctors, low-quality physical infrastructure, and weakly functioning government institutions.[435] One study yielded results of the spatio-temporal evolution of the viral outbreak. With the use of heat maps, it was determined that the outbreak did not uniformly unfold over the affected community areas. Growth in the regions of Guinea, Liberia and Sierra Leone was very different over time, indicating that monitoring the outbreak at district level was important. Visual inspection of incidence curves alone could not render the needed results or data; growth rates with a two-dimensional heat map were used. Finally, the study showed that accurate predictions of growth were improbable, coupled with knowledge about the disease that was not fully adequate at the time (as there were now cases of sexual transmission).[436]

Statistical measures

Calculating the case fatality rate (CFR) accurately is difficult in an ongoing epidemic due to differences in testing policies, the inclusion of probable and suspected cases, and the inclusion of new cases that have not run their course. In August 2014, the WHO made an initial CFR estimate of 53%, though this included suspected cases.[437][438] In September and December 2014, the WHO released revised and more accurate CFR figures of 70.8% and 71% respectively, using data from patients with definitive clinical outcomes.[12][13][14] The CFR among hospitalised patients, based on the three intense-transmission countries, was between 57% and 59% in January 2015.[15]

Mortality is measured by number of deaths in a population per the proportion of the population per unit of time.[439]

The basic reproduction number, R₀, is a statistical measure of the average number of people expected to be infected by one person who has a disease. If the rate is less than 1, the infection dies out; if it is greater than 1, the infection continues to spread—with exponential growth in the number of cases.[440] In September 2014, the estimated R₀ were 1.71 (95% CI, 1.44 to 2.01) for Guinea, 1.83 (95% CI, 1.72 to 1.94) for Liberia, and 2.02 (95% CI, 1.79 to 2.26) for Sierra Leone.[12][441][442] In October 2014, the WHO noted that exponential increase of cases continued in the three countries with the most intense transmission.[443]

Projections of future cases

On 28 August 2014, the WHO released its first estimate of the possible total cases from the outbreak as part of its road map for stopping the transmission of the virus. It stated that "this Roadmap assumes that in many areas of intense transmission the actual number of cases may be two- to fourfold higher than that currently reported. It acknowledges that the aggregate case load of Ebola could exceed 20,000 over the course of this emergency. The Roadmap assumes that a rapid escalation of the complementary strategies in intense transmission, resource-constrained areas will allow the comprehensive application of more standard containment strategies within three months." The report included an assumption that some country or countries would pay the required cost of their plan, estimated at half a billion US dollars.[311]

When the WHO released these estimates, a number of epidemiologists presented data to show that the WHO projection of a total of 20,000 cases was likely an underestimate.[444][445] On 9 September, Jonas Schmidt-Chanasit of the Bernhard Nocht Institute for Tropical Medicine in Germany, controversially announced that the containment fight in Sierra Leone and Liberia had already been "lost" and that the disease would "burn itself out".[446]

On 23 September 2014, the WHO revised their previous projection, stating that they expected the number of Ebola cases in Western Africa to be in excess of 20,000 by 2 November 2014.[12] They further stated, that if the disease was not adequately contained it could become native in Guinea, Sierra Leone and Liberia, "spreading as routinely as malaria or the flu",[447] and according to an editorial in the New England Journal of Medicine, eventually to other parts of Africa and beyond.[448]

In a report released on 23 September 2014, the CDC analysed the impact of under-reporting, which required correction of case numbers by a factor of up to 2.5. With this correction factor, approximately 21,000 total cases were estimated for the end of September 2014 in Liberia and Sierra Leone alone. The same report predicted that total cases, including unreported cases, could reach 1.4 million in Liberia and Sierra Leone by the end of January 2015 if no improvement in intervention or community behaviour occurred.[24] However, at a congressional hearing on 19 November, the Director of the CDC said that the number of Ebola cases was no longer expected to exceed 1 million, moving away from the worst-case scenario that had been previously predicted.[449]

A study published in December 2014 found that transmission of the Ebola virus occurs principally within families, in hospitals and at funerals. The data, gathered during three weeks of contact tracing in August, showed that the third person in any transmission chain often knew both the first and second person. The authors estimated that between 17% and 70% of cases in Western Africa were unreported—far fewer than had been estimated in prior projections. The study concluded that the epidemic would not be as difficult to control as feared, if rapid, vigorous contact tracing and quarantines were employed.[450]

Projections of future cases should also reflect the possibility that deforestation might have a hand in terms of the more recent Ebola outbreaks. It has been suggested that due to the clearing of forest for commercial use, various types of bats namely fruit bats may be taken out of their natural habitat and therefore into closer and potential contact with civilisation.[292][291]

Economic effects

UNDG, improves efficiency in needing countries

In addition to the loss of life, the outbreak had a number of significant economic impacts. In March 2015, the United Nations Development Group reported that due to a decrease in trade, closing of borders, flight cancellations, and drop in foreign investment and tourism activity fuelled by stigma, the epidemic resulted in vast economic consequences both in the affected areas and throughout Africa.[51] A September 2014 report in the Financial Times suggested that the economic impact of the Ebola outbreak could kill more people than the disease itself.[451]

With regard to Ebola and economic activity in the country of Liberia, a study found that 8% of automotive firms, 8% of construction firms, 15% of food businesses and 30% of restaurants had closed due to the Ebola outbreak. Montserrado county experienced up to 20% firm closure. This indicated a decline in the Liberian national economy during the outbreak, as well as an indication that the county of Montserrado was hardest hit economically. The capital city Monrovia suffered construction and restaurant unemployment the most, while outside the capital, the food and beverage sectors suffered economically. A recuperation in the economy, at the end of the outbreak, was expected to be more rapid in some sectors than in others. Also, if the massive decline in economic activity persisted, the authors suggested a focus on economic recovery in addition to support for the healthcare system. The World Bank had projected an estimated loss of $1.6 billion in productivity for all three affected Western African countries combined for 2015. In Liberian counties that were less affected by the outbreak, the number of individuals employed fell by 24%. Montserrado saw a 47% decline in employment per firm in contrast to what was obtained prior to the Ebola outbreak.[452]

Another study showed that the economic effect of the Ebola outbreak would be felt for years due to preexisting social vulnerability. The economic effects were being felt nationwide in Liberia, such as the termination of expansions in the mining business. Initial scenarios had placed expected economic losses at $25 billion; however subsequent World Bank estimates were much lower, at about 12% of the combined GDP of the 3 worst hit countries.[453] The authors went on to state that social vulnerability has multiple factors and proposed a classification based on multiple variables instead of single indicators such as food insecurity or lack of hospitals, which were problems faced by rural Liberians. In spite of the end of civil violence since 2003 and inflows from international donors, the reconstruction of Liberia had been very slow and non-productive—water delivery systems, sanitation facilities and centralised electricity were practically non-existent, even in Monrovia. Even before the outbreak, medical facilities did not have potable water, lighting or refrigeration. The authors indicated that lack of food and other economic effects would probably continue in the rural population long after the Ebola outbreak had ended.[453]

Other economic impacts were as follows:

In August 2014 it was reported that many airlines had suspended flights to the area.[454] Markets and shops had closed due to travel restrictions, a cordon sanitaire, or fear of human contact, which led to loss of income for producers and traders.[455]
Movement of people away from affected areas disturbed agricultural activities.[456][457] The FAO warned that the outbreak could endanger harvests and food security in Western Africa,[458] and that with all the quarantines and movement limitations placed on them, more than 1 million people could be food insecure by March 2015.[459] By 29 July, the World Bank had given 10,500 tons of maize and rice seed to the 3 hardest-hit countries to help them to rebuild their agricultural systems.[460]
Tourism was directly impacted in the affected countries.[461] In April 2014, Nigeria reported that 75% of hotel business had been lost due to fears of the outbreak;[462] the limited Ebola outbreak had cost that country ₦8 billion.[463] Other African countries that were not directly affected by the virus also reported adverse effects on tourism.[464][465][466] For example, in 2015, it was reported that Gambia's tourism had fallen below 50 per cent of its normal business during the same period the prior year,[467][468] Elmina Bay in Ghana had an 80% decrease in US tourism,[469] and Kenya,[470] Zimbabwe,[471] Senegal, Zambia, and Tanzania also reported a drop.[472]
Some foreign mining companies withdrew all non-essential personnel, deferred new investment, and cut back operations.[457][473][474] In December 2014, it was reported that the iron ore mining company, African Minerals, had started the shutdown of its Sierra Leone operations because it was running low on income.[475] In March 2015, it was reported that Sierra Leone had begun to diversify away from mining, due to the country's recent problems.[476]

In January 2015, Oxfam, a UK-based disaster relief organisation, indicated that a "Marshall Plan" (a reference to the massive plan to rebuild Europe after World War II) was needed so that countries could begin to financially assist those that had been worst hit by the virus.[477] The call was repeated in April 2015 when the most-affected Western African countries asked for an $8 billion "Marshall Plan" to rebuild their economies. Speaking at the World Bank and the International Monetary Fund (IMF), Liberian president Ellen Johnson Sirleaf said the amount was needed because "[o]ur health systems collapsed, investors left our countries, revenues declined and spending increased."[478]

The IMF has been criticised for its lack of assistance in the efforts to combat the epidemic. In December 2014, a Cambridge University study linked IMF policies with the financial difficulties that prevented a strong Ebola response in the three most heavily affected countries,[479] and they were urged by both the UN and NGOs who had worked in the affected countries to grant debt relief rather than low-interest loans. According to one advocacy group, "... yet the IMF, which has made a $9 billion surplus from its lending over the last three years, is considering offering loans, not debt relief and grants, in response".[480][481] On 30 January 2015, the IMF reported it was close to reaching a deal on debt forgiveness.[482] On 22 December, it was reported that the IMF had given Liberia an additional $10 million due to the economic impact of the Ebola virus outbreak.[483]

In October 2014, a World Bank report estimated overall economic impacts of between $3.8 billion and $32.6 billion, depending on the extent of the outbreak and speed of containment. It expected the most severe losses in the three affected countries, with a wider impact across the broader Western African region.[484][485] On 13 April 2015, the World Bank said that they would soon announce a major new effort to rebuild the economies of the three hardest-hit countries.[486] On 23 July, a World Bank poll warned that "we are not ready for another Ebola outbreak".[487] On 15 December, the World Bank indicated that by 1 December 2015, it had marshalled $1.62 billion in financing for the Ebola outbreak response.[488]

On 6 July 2015, UN Secretary-General Ban Ki-moon announced that he would host an Ebola recovery conference to raise funds for reconstruction, stating that the three countries hardest hit by Ebola needed about $700 million to rebuild their health services over a two-year period.[489] On 10 July, it was announced that the countries most affected by the Ebola epidemic would receive $3.4 billion to rebuild their economies.[490][491] On 29 September, the leaders of both Sierra Leone and Liberia indicated at the UN General Assembly the launch of a "Post-Ebola Economic Stabilization and Recovery Plan".[492] On 24 November, it was reported that due to the decrease in commodity prices and the Western African Ebola epidemic, China's investment in the continent had declined 43% in the first 6 months of 2015.[493] On 25 January, the IMF projected a GDP growth of 0.3% for Liberia, that country indicating it would cut spending by 11 per cent due to a stagnation in the mining sector, which would cause a domestic revenues drop of $57 million.[494]

Responses

In July 2014, the WHO convened an emergency meeting of health ministers from eleven countries and announced collaboration on a strategy to co-ordinate technical support to combat the epidemic. In August they published a road map to guide and coordinate the international response to the outbreak, aiming to stop ongoing Ebola transmission worldwide within 6–9 months, and formally designated the outbreak as a Public Health Emergency of International Concern.[48] This is a legal designation used only twice before (for the 2009 H1N1 (swine flu) pandemic and the 2014 resurgence of poliomyelitis) that invokes legal measures on disease prevention, surveillance, control, and response, by 194 signatory countries.[495][496]

In September 2014, the United Nations Security Council declared the Ebola virus outbreak in Western Africa "a threat to international peace and security" and unanimously adopted a resolution urging UN member states to provide more resources to fight the outbreak.[497][498] In October, WHO and the UN Mission for Ebola Emergency Response announced a comprehensive 90-day plan to control and reverse the Ebola epidemic. The ultimate goal was to have capacity in place for the isolation of 100% of Ebola cases and the safe burial of 100% of casualties by 1 January 2015 (the 90-day target).[499] Many nations and charitable organisations cooperated to realise the plan,[500] and a WHO situation report published mid-December indicated that the international community was on track to meet the 90-day target.[501]

In May 2015, Dr Margaret Chan indicated, "demands on WHO were more than ten times greater than ever experienced in the almost 70-year history of this Organization"[502][503] and on 23 March, she stated that "the world remains woefully ill-prepared to respond to outbreaks that are both severe and sustained."[504]

Criticism of WHO

WHO flag

There was significant criticism of the WHO from some aid agencies because its response was perceived as slow and insufficient, especially during the early stages of the outbreak.[47][505] In October 2014, the Associated Press reported in an internal draft document that the WHO admitted "nearly everyone" involved in the Ebola response failed to notice factors that turned the outbreak into the largest on record, and that they had missed chances to stop the spread of Ebola due to "incompetent staff, bureaucracy and a lack of reliable information".[506] Peter Piot, co-discoverer of the Ebola virus, called the WHO regional office in Africa "really not competent."[507] In April 2015, the WHO admitted very serious failings in handling the crisis and indicated reforms for any future crises; "we did not work effectively in coordination with other partners, there were shortcomings in risk communications and there was confusion of roles and responsibilities".[508] The Ebola crisis was discussed at the June 2015 G7 meeting. The leaders pledged to assist in carrying out WHO regulations. Critics criticised the G7 leaders, saying they were not committed enough in the fight against the possibility of future pandemics.[509][510]

In 2015 a panel of experts looked at the ways of preventing small outbreaks from becoming large epidemics. Their recommendations were published in the November issue of The Lancet. According to the panel, the epidemic had exposed problems in the national (and international) institutions responsible for protecting the public from the human consequences of infectious disease outbreaks such as the Ebola epidemic. The panel was highly critical of the WHO's management of the Ebola crisis noting that it took them months to respond and when they did they were slow to act, poorly co-ordinated and inadequately informed. The report pointed out that the committee responsible for checking the WHO's actions during the outbreak (i.e. the WHO Ebola Interim Assessment Panel) had delayed responses due to worries about political resistance from the Western African leaders, economic consequences, and a system within the WHO that discouraged open debate about issues such as emergency declarations. The WHO may also have hesitated because it was criticised for creating panic by declaring a public health emergency during the relatively mild 2009 H1N1 pandemic. This, the report states, showed the risks in having such consequential decision-making power in one individual—a risk made worse when there was no mechanism of responsibility for such leadership failure.[511][512][513]

The panel outlined 10 recommendations for the prevention and handling of future infectious disease outbreaks. Included in the recommendations of the changes needed to fight future outbreaks is the creation of a U.N. Security Council health committee to expedite political attention to health issues and the establishment of a global fund to finance and accelerate the development of outbreak-relevant drugs and treatment. The report also noted that competent governance of the global system demanded political leadership and a WHO that is more focused and appropriately financed and whose integrity is restored through the application of adequate reforms and leadership.[511]

The WHO also came under fire for refusing to send Dr. Olivet Buck to Germany for experimental treatment after she contracted Ebola per the government of Sierra Leone's request. WHO claimed they could only evacuate medical professionals they had deployed to the region, not locals. Dr. Olivet Buck was the Medical Superintendent at Lumley Government Hospital in Freetown, Sierra Leone. It's believed that she contracted the virus while continuing to treat patients even during a shortage of personal protective equipment. Her loyalty and dedication to her community never wavered.[514]

Timeline of reported cases and deaths

Major Ebola virus outbreaks by country and by date – to most recent WHO / Gov update- 14 January 2016
Date	Total		Guinea		Liberia		Sierra Leone		Sources
Date	Cases	Deaths	Cases	Deaths	Cases	Deaths	Cases	Deaths	Sources
14 January 2016	28,542	11,299	3,806	2,535	10,675	4,809	14,061	3,955	[note 2][515]
23 December 2015	28,542	11,299	3,806	2,535	10,676	4,809	14,061	3,955	[516]
9 December 2015	28,542	11,299	3,806	2,535	10,675	4,809	14,061	3,955	[517]
25 November 2015	28,539	11,298	3,806	2,535	10,672	4,808	14,061	3,955	[518]
11 November 2015	28,539	11,298	3,806	2,535	10,672	4,808	14,061	3,955	[519]
25 October 2015	28,539	11,298	3,800	2,534	10,672	4,808	14,061	3,955	[520]
11 October 2015	28,454	11,297	3,800	2,534	10,672	4,808	13,982	3,955	[521]
Note 1: Cases include confirmed, probable and suspected per the WHO, numbers are the cumulative figures as published on the given date, and due to retrospective revisions, differences between successive weekly totals are not necessarily the number of new cases that week. Note 2: Data are from reports by the WHO Global Alert and Response Unit[Resource 1] and the WHO's Regional Office for Africa.[Resource 2] All numbers are correlated with UN Office for the Coordination of Humanitarian Affairs (OCHA), if available.[Resource 3] The reports were sourced from official information from the affected countries' health ministries. The WHO has stated that the reported numbers "vastly underestimate the magnitude of the outbreak", estimating there may be three times as many cases as officially reported.[24][522][523] Note 3: Date is the "as of" date from the reference. A single source may report statistics for multiple "as of" dates.

Minor Ebola virus outbreaks by country and by date – 30 July 2014 to most recent WHO / Gov update 30 August 2015
Date	Aggregate Total		Nigeria		Senegal		United States		Spain		Mali		United Kingdom		Italy		Refs
Date	Cases	Deaths	Cases	Deaths	Cases	Deaths	Cases	Deaths	Cases	Deaths	Cases	Deaths	Cases	Deaths	Cases	Deaths	Refs
30 August 2015	36	15	20	8	1	0	4	1	1	0	8	6	1	0	1	0	[note 3][524]
29 December 2014	35	15	20	8	1	0	4	1	1	0	8	6	1	0	–	–	[note 4][14]
14 December 2014	32	15	20	8	1	0	4	1	1	0	6	6	–	–	–	–	[128]
2 November 2014	27	10	20	8	1	0	4	1	1	0	1	1	–	–	–	–	[525]
12 October 2014	23	8	20	8	1	0	1	0	1	0	-	–	–	–	–	–	[526]
28 September 2014	22	8	20	8	1	0	1	0	-	–	-	–	–	–	–	–	[527]
30 July 2014	3	1	3	1	–	–	–	–	–	–	–	–	–	–	–	–	[528]
Note 1:This table contains countries that had limited local cases.[529] Note 2:Date is the "as of" date from the reference. A single source may report statistics for multiple "as of" dates.

Notable patients

Patrick Sawyer—index case for Nigeria; died on 24 July 2014.[530]
Sheik Umar Khan—was a Sierra Leonean doctor, died on 29 July 2014.[531]
Ameyo Adadevoh—curbed a wider spread of the virus in Nigeria; died on 19 August 2014.[532]
Thomas Eric Duncan—first Ebola patient diagnosed in U.S.; died on 8 October 2014.[533]
Salome Karwah—survived Ebola in 2014 and became a nurse; named co-Person of the Year by Time magazine; Karwah died of complications of childbirth in February 2017.[534]
Ian Crozier—contracted the disease in September 2014, was treated at Emory University from 9 September to 19 October of that year.[535]
Pauline Cafferkey—British nurse and aid worker, infected in 2014, recovered, but has subsequently been readmitted to hospital several times.[536]

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Notes

The mortality (number of dead per number of healthy per time frame) recorded in Liberia up to 26 August 2014 was 70%.[13] However, due to the estimation method used, the estimated case fatality rate (70.8%) for this particular epidemic differs from the actual ratio between the number of deaths and the number of cases.
25 Oct: All governments as per WHO.
No change in Data from 13 May till 30 Aug
29 December: All governments as per WHO. United Kingdom case dated 29 December.

References

This article was submitted to WikiJournal of Medicine for external academic peer review in 2018 (reviewer reports). The updated content was reintegrated into the Wikipedia page under a CC-BY-SA-3.0 license (2019). The version of record as reviewed is: Osmin Anis; et al. (2019), "Western African Ebola virus epidemic", WikiJournal of Medicine, 6 (1), doi:10.15347/WJM/2019.001, Wikidata Q63740114

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"Outbreak Updates". World Health Organization (WHO). Archived from the original on 24 April 2015. Retrieved 11 April 2015.
"Outbreak Updates". US Centers for Disease Control and Prevention (CDC). Retrieved 11 April 2015.
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"Platform to share communication materials regarding the Ebola epidemic". Ebola Communication Network. Retrieved 11 April 2015.
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"Battling the Ebola Outbreak in West Africa". MSF USA. Doctors Without Borders/Médecins Sans Frontières. 25 July 2014. Archived from the original on 12 June 2018. Retrieved 9 June 2018.

Resources

"Disease Outbreak News (DONs)". Global Alert and Response (GAR). WHO. Retrieved 11 April 2015. This website's content changes frequently.
"Disease Outbreak News". Regional Office for Africa. WHO. Archived from the original on 24 April 2015. Retrieved 11 April 2015. This website's content changes frequently.
"West and Central Africa". HumanitarianResponse.info. OCHA. Retrieved 11 April 2015.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.

[cfr-15] The mortality (number of dead per number of healthy per time frame) recorded in Liberia up to 26 August 2014 was 70%.[13] However, due to the estimation method used, the estimated case fatality rate (70.8%) for this particular epidemic differs from the actual ratio between the number of deaths and the number of cases.

[516] 25 Oct: All governments as per WHO.

[529] No change in Data from 13 May till 30 Aug

[531] 29 December: All governments as per WHO. United Kingdom case dated 29 December.

[1] "WHO Director-General addresses the Executive Board". Retrieved 9 June 2016.

[tru-2] Brice, Makini (9 June 2016). "WHO declares Liberia free of active Ebola virus transmission". Thomson Reuters Foundation. Retrieved 16 October 2016.

[3] Donald G. McNeil Jr. (16 December 2015). "Fewer Ebola cases go unreported than thought, study finds". The New York Times. Retrieved 23 July 2015.

[16who16-4] "Ebola Situation Report – 16 March 2016 | Ebola". World Health Organization. Retrieved 28 October 2016.

[guinn-5] "End of Ebola transmission in Guinea". WHO Regional Office for Africa. 2015. Retrieved 9 June 2016.

[WHO20141022-6] Ebola Response Roadmap Situation Report (PDF) (Report). WHO. 22 October 2014. Retrieved 22 October 2014.

[WHO2015_01_21-7] "Ebola situation report" (PDF). World Health Organization. 21 January 2015. Retrieved 22 January 2015.

[WHO2014_12_23-8] "Ebola response roadmap – Situation report 24 December 2014". World Health Organization. 26 December 2014. Retrieved 29 December 2014.

[9] "Ebola situation report". World Health Organization. 22 July 2015.

[Uk_10_March-10] United Kingdom is declared free of Ebola virus disease (Report). WHO Europe. Retrieved 11 March 2015.

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