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to meningitis. There are, no doubt, many food-borne out-
Gastroenteritis by P. shigellosides is breaks and cases caused by a variety of
characterized by diarrhea, abdominal pain, viruses, but scientists in many cases are not
nausea, chills, fever, headache, and vomiting able to identify the sources of the infection.
after an incubation time of 1 to 2 days. Viruses that have been incriminated in food-
Symptoms last for a week or longer. All borne diseases include hepatitis A virus
reported foods involved with cases of gastro- (oysters, clams, doughnuts, sandwiches, and
enteritis were from aquatic origin (salted fish, salad), Norwalk virus (oysters), polio virus
crabs, and oysters). The organism can be iso- (milk and oysters), ECHO virus (oysters),
lated from a variety of sources, including enteroviruses (oysters), and coxsackievirus
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