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Norovirus is a common viral infection that causes a person to develop a rapid onset of nausea, vomiting, diarrhea, and occasionally stomach cramping (all symptoms of gastroenteritis). In addition, the person may feel tired, have muscle aches, a headache, and a low-grade fever (less than 101 F) with chills. The symptoms last about one to two days.
After infection, immunity to norovirus is usually incomplete and temporary, with one publication drawing the conclusion that protective immunity to the same strain of norovirus lasts for six months, but that all such immunity is gone after two years.any norovirus outbreaks have been traced to food that was handled by one infected person. The genus name Norovirus is derived from Norwalk virus, the only species of the genus.