Virion 

Nucleic acid

Length of genome (Du et al., 2016, Phan et al., 2011, Lim et al., 2014): c. 8,931 nt (5'-UTR: up to 828 nt; ORF: 7,413 nt; 3' UTR: up to 795 nt). 5'-UTR harbours a type II IRES. 3'-UTR is the longest of picornaviruses. The location of the cre has not been identified.

Genome organization and replication

Genome layout:

VPg+5'UTR^IRES-II[1AB-1C-1D-2A^npgp/2B-2C/3A-3B-3C-3D]3'UTR-poly(A)

The deduced polyprotein has a length of 2,468 aa. 1AB remains uncleaved. 2A is an aphthovirus-like polypeptide with NPG¯P motif.

Antigenicity

See discussion under family description.

Biology

Viral RNA was detected in faecal samples of human and rodents [canyon mouse (Peromyscus crinitus), rat (Rattus norvegicus)].

Species demarcation criteria

The single species Rosavirus A includes two genetic types.

Member species

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

Derivation of names

Rosa: from rodent stool-associated

Related, unclassified viruses

Further related genome sequences have been identified in rats (Rattus norvegicus, R. andamanensis, R. rattus, R. losea, Niviventer fulvescens and N. coxingi) which probably belong to two new rosavirus species.

Virus names and virus abbreviations are not official ICTV designations.