Genus: Valovirus

Genus: Valovirus

Distinguishing features

The strains in this genus form a distinct clade within the family Caliciviridae (Figure 4.Caliciviridae).


See discussion under family description.

Genome organization and replication

The complete genome of valoviruses is 6.4 kb and comprises a large ORF at the 5′-end of the genome (ORF1) and a small ORF (ORF2) partly overlapping the 3′-end of ORF1. ORF1 encodes a polyprotein with a predicted molecular mass of 256.5 kDa while ORF2 encodes a protein with a predicted molecular mass of 13.1 kDa. Valoviruses belong to a single species, Saint Valerien virus.


A novel calicivirus phylogenetically distinguished from other calicivirus genera was detected in stool samples from pigs in the town St. Valérien in Quebec, Canada (L'Homme et al., 2009).

Species demarcation criteria 

Not defined as there is only one species in the genus.

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Saint Valerien virusSt-Valérien calicivirusAB90/CAN/2006FJ355928NC_012699Complete genomeSVCV

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