Genus: Passerivirus

Genus: Passerivirus

Distinguishing features

The genus is distinguished on the basis of genetic characters.



No details are available on the morphology of the virions.

Nucleic acid

Genome (Woo et al., 2010, Pankovics et al., 2018): up to 9,130 nt (5′-UTR: c. 807 nt; ORF: 7,287-8,004 nt; 3′-UTR: 319-334 nt). The location of the cre has not been identified. 

Genome organization and replication

Genome layout:


The deduced polyprotein is of 2,428 aa (passerivirus A1) and 2,668 aa (passerivirus B1), respectively. There is a long L protein. 1AB protein (with myristoylation signal) remains uncleaved. 2A protein has a H-box/NC sequence motif.


Viral RNA was detected in faeces of thrushes (Turdus hortulorum, T. merula, T. pallidus) and diseased home-reared estrildid finches (Uraeginthus spec.).

Derivation of names

Passeri-: from the order Passeriformes (perching birds), from Latin passer, 'sparrow'

Species demarcation criteria

Members of a species of genus Passerivirus:

  • share a common genome organization,
  • are less than 30% divergent in the polyprotein aa sequence,
  • are less than 30% divergent in the P1 aa sequence,
  • are less than 25% divergent in the 2C + 3CD aa sequence. 

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Passerivirus Apasserivirus Athrush/Hong Kong/00356/2007GU182406NC_014411Complete genomePasV-A
Passerivirus Bwaxbill passeriviruswaxbill/DB01/HUN/2014MF977321NC_036588Complete genomePasV-B

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