NCIt definition : A genus of non-enveloped, capsid covered viruses with T 3 icosahedral symmetry, in
the family Caliciviridae. The genome is composed of a linear, single-strand of positive
sense RNA. Noroviruses are transmitted by the fecal-oral route and cause gastroenteritis
in humans.;
Alternative definition : CDISC: Any viral organism that can be assigned to the genus Norovirus.;