Norovirus causes acute gastroenteritis in humans and is highly
contagious. During outbreaks, several modes of transmission
have been documented. For example, initial foodborne
transmission happens in a restaurant, followed by secondary
person-to-person transmission to household contacts.
Currently, there are at least five norovirus genogroups (GI, GII,
GIII, GIV and GV), which in turn are divided into at least 31
genetic clusters. Fluid replacement and correcting electrolyte
disturbances through oral and intravenous fluid administration
are the most typical Norovirus treatment.