Family: Picornaviridae

Genus: Orivirus


Distinguishing features

The genus is distinguished on the basis of genetic characters. 



No details are available on the morphology of virions. 

Nucleic acid

Genome (Boros et al., 2014aBoros et al., 2016): 7,037 nt (5′-UTR: 734 nt; ORF: 5,925 nt; 3′-UTR: 376 nt). The location of the cre has not been identified. 

Genome organization and replication

Genome layout:


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.