Okavirus

{{Short description|Genus of viruses}}

{{Use dmy dates|date=April 2017}}

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{{Virusbox

| name = Okavirus

| image = Roniviridae virion.jpg

| image_caption = Roniviridae virion

| image2 = OPSR.Roni.Fig2.v5 WEB.png

| image2_caption = Yellow head virus genome

| image_alt =

| taxon = Tipravirus

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| subdivision =

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Okavirus is a genus of enveloped positive-strand RNA viruses which infect crustaceans. Host organisms are mostly shrimp.{{cite journal |last1=Walker |first1=PJ |last2=Cowley |first2=JA |last3=Dong |first3=X |last4=Huang |first4=J |last5=Moody |first5=N |last6=Ziebuhr |first6=J |last7=ICTV Report Consortium |title=ICTV Virus Taxonomy Profile: Roniviridae. |journal=The Journal of General Virology |date=January 2021 |volume=102 |issue=1 |doi=10.1099/jgv.0.001514 |pmid=33108263|pmc=8116784 |doi-access=free }} Viruses associated with the genus include: gill-associated virus (GAV) which causes reddening, biofouling with exoparasites, emaciation, and massive mortality; and yellow head virus (YHV) which causes yellow head, arrest of feeding, and massive mortality.{{cite web|title=ICTV Report Roniviridae|url=http://www.ictv.global/report/roniviridae}}{{cite web|title=Viral Zone|url=http://viralzone.expasy.org/all_by_species/290.html|publisher=ExPASy|access-date=15 June 2015}} 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. There are three species in this genus.