Caliciviridae is a family of
viruses, members of Class IV of the
Baltimore scheme. They are
positive-sense, single stranded
RNA which is non-segmented. There are currently seven species in this family, divided among 5 genera. Diseases associated with this family include: feline calicivirus: respiratory disease; rabbit hemorrhagic disease virus: often-fatal hemorrhages; norwalk group of viruses: gastroenteritis. Caliciviruses naturally infect
vertebrates, and have been found in a number of organisms such as
humans,
cattle,
pigs,
cats,
chickens,
reptiles,
dolphins and
amphibians. The caliciviruses have a simple construction and are not
enveloped. The
capsid appears
hexagonal/
spherical and has
icosahedral symmetry (
T=1]or
T=3]ref name=ViralZone />) with a diameter of 35–39 nm.