4 links
BioMed Central :A summertime peak of "winter vomiting disease": Surveillance of noroviruses in England and Wales, 1995 to 2002
biomedcentral.com
Research article on the disease.
Norwalk Virus Gastroenteritis: A Different Type of Foodborne Illness, HYG-5569-98
ohioline.osu.edu
Ohio State University Extension fact sheet providing basic information on the subject.
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