Table 1.

Characteristics of members of the family Caliciviridae

Typical member:	Norwalk virus (M87661), species Norwalk virus, genus Norovirus
Virion	Non-enveloped with icosahedral symmetry, 27–40 nm in diameter
Genome	Single-stranded, positive-sense genomic RNA of 7.4–8.3 kb, with a 5′-terminal virus protein, genome-linked (VPg) and 3′-terminal poly(A)
Replication	Cytoplasmic
Translation	From genome-sized (non-structural proteins) and 3′-terminal subgenomic (structural proteins) mRNAs
Host range	Mammals (Lagovirus, Norovirus, Nebovirus, Recovirus, Sapovirus, Valovirus and Vesivirus), birds (Bavovirus, Nacovirus), fish (Minovirus, Salovirus)
Taxonomy	Realm Riboviria; more than ten genera