Genus: Orivirus

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. 

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Orivirus Aorivirus A1; chicken orivirus 1chicken/Pf-CHK1/2013/HUNKM203656NC_025432Complete genomeOrV-A1
Orivirus Achicken orivirus 2Pf-CHK1/OrV-A2KT880664Complete genomeOrV-A2

Virus names, the choice of exemplar isolates, and virus abbreviations, are not official ICTV designations.