The genus is distinguished on the basis of genetic characters.
No details are available on the morphology of virions.
Genome organization and replication
The deduced polyprotein is of 1,975 amino acids. There is no L protein. The 1AB protein remains uncleaved. The function of the 2A protein is unknown.
No virus has been isolated. Viral RNA was detected in cloacal samples of diseased chickens in Hungary. Two genetic types are distinguished by means of phylogenetic analysis.
Derivation of names
Orivirus-: from Orosháza (town in Hungary where the cloacal sample was taken)
Species demarcation criteria
There is only a single species in the genus.