''Okavirus'' is a genus of enveloped positive-strand RNA viruses which infect

crustacean Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can ...

s. Host organisms are mostly shrimp. It is the only genus in the family ''Roniviridae''. 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. 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 Penaeidae is a family of marine crustaceans in the suborder Dendrobranchiata, which are often referred to as penaeid shrimp or penaeid prawns. The Penaeidae contain many species of economic importance, such as the tiger prawn, whiteleg shrimp, ...

. There are three species in this genus.

Structure

Viruses in the genus ''Okavirus'' are enveloped, with bacilliform geometries, and helical symmetry. The diameter is around 20–30 nm.

Genome

Genomes are linear and non-segmented, around 26 kb in length.

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.

Taxonomy

The genus contains one subgenus with three species: *'' Tipravirus'' **''

Gill-associated virus ''Okavirus'' is a genus of enveloped positive-strand RNA viruses which infect crustaceans. Host organisms are mostly shrimp. It is the only genus in the family ''Roniviridae''. Viruses associated with the genus include: gill-associated virus ( ...

'' **'' Okavirus 1'' **'' Yellow head virus''

References

External links

ICTV Report: ''Roniviridae''

{{Taxonbar, from=Q3775810, from2=Q7365724, from3=Q57751806, from4=Q57754796 Roniviridae Virus genera