A group of viruses belonging to the family Caliciviridae
that includes:
Norovirus, a common cause of food poisoning and acute gastroenteritis in
humans;
Sapovirus, formerly called "Sapporo-like virus" (SLV) and sometimes referred
to as classic or typical calicivirus, which can also cause gastroenteritis in
humans;
Vesivirus, the swine vesicular exanthema virus; and
Lagovirus, the rabbit haemorrhagic disease virus.
The hepatitis E virus, once considered a calicivirus, now belongs to an unassigned
(or floating) genus called the hepatitis E-like viruses.
All of the caliciviruses are single-stranded RNA, nonenveloped viruses. Their
genetic information is encoded in a single strand of RNA and they lack an envelope.
The name calicivirus comes from their characteristic "Star of David" shape with
cup-shaped (chalice) indentations.
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