Norovirus Causes Most Hospital Infection Outbreaks

The virus, which causes a "stomach flu" known as gastroenteritis, was the culprit in some 18% of all outbreaks in U.S. hospitals during a two-year period. It also was responsible for 65% of unit closures in health care facilities.

Norovirus has also been associated with outbreaks on cruise ships.

Symptoms of norovirus infection include nausea, vomiting, diarrhea, and stomach cramps. In a hospital setting, this rapidly spreading infection can be transmitted from person to person by having direct contact with someone who has the virus, by touching contaminated objects or surfaces, or from eating contaminated food or water.

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