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.