Norwalk virus

**Definition:** The type species in the genus NOROVIRUS, first isolated in 1968 from the stools of school children in Norwalk, Ohio, who were suffering from GASTROENTERITIS. The virions are non-enveloped spherical particles containing a single protein. Multiple strains are named after the places where outbreaks have occurred.

**Tree numbers:** - B04.820.578.298.550.500

**Synonyms:** - Norwalk Agent