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 2,428 aa (passerivirus A1) and 2,668 aa (passerivirus B1), respectively. There is a long L protein of unknown function. The 1AB protein (with myristoylation signal) remains uncleaved. The 2A protein has an H-box/NC sequence motif.
No virus has been isolated. Viral RNA was detected in faeces of thrushes (Turdus hortulorum, T. merula, T. pallidus) and diseased home-reared estrildid finches (Uraeginthus sp. ).
Derivation of names
Passerivirus: 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