Severe fever with thrombocytopenia syndrome

Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease caused by Dabie bandavirus also known as the SFTS virus, first reported between late March and mid-July 2009 in rural areas of Hubei and Henan provinces in Central China.[1] SFTS has fatality rates ranging from 12% to as high as 30% in some areas. The major clinical symptoms of SFTS are fever, vomiting, diarrhea, multiple organ failure, thrombocytopenia (low platelet count), leucopenia (low white blood cell count), and elevated liver enzyme levels.

Severe fever with thrombocytopenia syndrome
SFTS bunyavirus isolated from patients in Central and Northeast provinces of China (red)
SpecialtyInfectious disease

Virology

SFTS virus (SFTSV) is a virus in the order Bunyavirales. Person-to-person transmission was not noted in early reports[1] but has since been documented.[2]

The life cycle of the SFTSV most likely involves arthropod vectors and animal hosts. Humans appear to be largely accidental hosts. SFTSV has been detected in Haemaphysalis longicornis ticks.

Epidemiology

SFTS occurs in China's rural areas from March to November with the majority of cases from April to July. In 2013, Japan and Korea also reported several cases with deaths.[3]

In July 2013, South Korea reported total eight deaths since August 2012.[4]

In July 2017, Japanese doctors reported that a woman had died of SFTS after being bitten by a cat that may have itself infected by a tick. The woman had no visible tick bites, leading doctors to believe that the cat — which died as well — was the transmission vector.[5][6]

In early 2020, more than 37 people were found with SFTS in Jiangsu province in East China while 23 more were found with SFTS in Anhui province in August 2020.[7]Seven people died from them.[8]

Evolution

The virus originated 50–150 years ago and has undergone a recent population expansion.[9]

History

In 2009 Xue-jie Yu and colleagues isolated the SFTS virus (SFTSV) from SFTS patients’ blood.

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References
  1. Yu, Xue-Jie; Liang, Mi-Fang; Zhang, Shou-Yin; Liu, Yan; Li, Jian-Dong; Sun, Yu-Lan; Zhang, Lihong; Zhang, Quan-Fu; Popov, Vsevolod L.; Li, Chuan; Qu, Jing (2011-04-21). "Fever with Thrombocytopenia Associated with a Novel Bunyavirus in China". New England Journal of Medicine. 364 (16): 1523–1532. doi:10.1056/NEJMoa1010095. ISSN 0028-4793. PMC 3113718. PMID 21410387.
  2. Liu, Yan; Li, Qun; Hu, Wanfu; Wu, Jiabin; Wang, Yubi; Mei, Ling; Walker, David H.; Ren, Jun; Wang, Yu (February 2012). "Person-to-person transmission of severe fever with thrombocytopenia syndrome virus". Vector Borne and Zoonotic Diseases (Larchmont, N.Y.). 12 (2): 156–160. doi:10.1089/vbz.2011.0758. ISSN 1557-7759. PMID 21955213.
  3. Severe fever w/ thrombocytopenia synd. - Japan, South Korea: update Archive Number: 20130526.1738022
  4. "S. Korea says death toll from tick-borne virus rises to 8 | YONHAP NE…". Archived from the original on 2013-07-05.
  5. "Japanese woman dies from tick disease after cat bite". BBC News. 2017-07-25. Retrieved 2017-07-25.
  6. "Japanese woman died from tick-borne illness after cat bite, health ministry says". Japan Times. 2017-07-25. Retrieved 2017-07-25.
  7. https://indianexpress.com/article/explained/tick-borne-virus-spreading-in-china-6543182/
  8. https://indianexpress.com/article/world/china-tick-borne-virus-6541829/
  9. Lam, Tommy Tsan-Yuk; Liu, Wei; Bowden, Thomas A.; Cui, Ning; Zhuang, Lu; Liu, Kun; Zhang, Yao-Yun; Cao, Wu-Chun; Pybus, Oliver G. (March 2013). "Evolutionary and molecular analysis of the emergent severe fever with thrombocytopenia syndrome virus". Epidemics. 5 (1): 1–10. doi:10.1016/j.epidem.2012.09.002. PMC 4330987. PMID 23438426.
Classification
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