Definition: virus caused by Norwalk virus, a 27-nm RNA virus in the family Caliciviridae frequently occurring in a group of people (in a school or small community) suddenly and without prodromal illness or malaise, is intense while it lasts, but ceases abruptly after 24–48 hours; symptoms are headache, abdominal pain, giddiness, and diarrhea in most of the cases, and extreme prostration in about 75%.
Synonym(s): epidemic nausea
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Examples: glitazone, GI cocktail, etc.