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Okavirus
''Okavirus'' is a genus of viruses in the order Nidovirales, in the family ''Roniviridae''. Okaviruses infect crustaceans, mostly prawns. There is currently only one species in this genus: the type species Gill-associated virus. Diseases associated with this genus include: GAV: reddening, biofouling with exoparasites, emaciation, massive mortality; YHV: yellow head, arrest of feeding. massive mortality.〔(【引用サイトリンク】url=http://viralzone.expasy.org/all_by_species/290.html )〕〔(【引用サイトリンク】title=Virus Taxonomy: 2014 Release )〕 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.
==Taxonomy==
Group: ssRNA(+)
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Two virus strains are recognized in this genus: Gill-associated virus and yellowhead virus. Both species were isolated from prawns.〔Cowley JA, Dimmock CM, Spann KM, Walker PJ (2000) Gill-associated virus of ''Penaeus monodon'' prawns: an invertebrate virus with ORF1a and ORF1b genes related to arteri- and coronaviruses. J Gen Virol 81(Pt 6):1473–1484〕〔Sittidilokratna N, Dangtip S, Cowley JA, Walker PJ (2008) RNA transcription analysis and completion of the genome sequence of yellow head nidovirus. Virus Res 136(1–2):157–165〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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