Okavirus

Okavirus is a genus of viruses in the order Nidovirales, in the family Roniviridae. Okaviruses infect crustaceans, mostly prawns. There are currently three species in this genus: the type species Gill-associated virus, Okavirus 1, and Yellow Head virus. Diseases associated with this genus include: GAV: reddening, biofouling with exoparasites, emaciation, massive mortality; YHV: yellow head, arrest of feeding. massive mortality.[1][2] The name is derived from the 'Oka' or lymphoid organ in which the viruses are commonly detected and in which pathology occurs during acute infections. Lymphoid organs are anatomical structures common to penaeid shrimp.

Tipravirus
Virus classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Pisuviricota
Class: Pisoniviricetes
Order: Nidovirales
Family: Roniviridae
Genus: Okavirus
Subgenus: Tipravirus
Type species
Gill-associated virus
Species
  • Gill-associated virus
  • Okavirus 1
  • Yellow head virus

Taxonomy

Group: ssRNA(+)

[2]

Structure

Viruses in Okavirus are enveloped, with bacilliform geometries, and helical symmetry. The diameter is around 20–30 nm. Genomes are linear and non-segmented, around 26 kb in length.[1]

GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
OkavirusBacilliformHelicalEnvelopedLinearMonopartite

Life cycle

Entry into the host cell is achieved by attachment to host receptors, which mediates endocytosis. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. Crustaceans and mostly prawns serve as the natural host. Transmission routes are ingestion.[1]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
OkavirusCrustaceans: prawnsNoneCell receptor endocytosisBuddingCytoplasmCytoplasmPassive diffusion

References

  1. "Viral Zone". ExPASy. Retrieved 15 June 2015.
  2. ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015.
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gollark: I suppose we'd have to ignore 1-letter symbols - there are too many.
gollark: It's easy, too, what with the 2-letter symbols.
gollark: _will now do this_
gollark: I wonder if anyone collects periodic table codes.
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