Vomiting and diarrhea a few hours after eating the raw oysters may probably have caused the illness is Norovirus.
Norovirus is the largest cause of illness from contaminated food in the U.S. The virus is usually spread when an infected food handler touches food before it is served. Oysters and other shellfish are occasionally naturally infected with the norovirus. Although eating raw or undercooked shellfish might infect you with norovirus, oysters are considerably more frequently consumed raw than other shellfish. Norovirus disease often has a sudden onset of nausea and vomiting and/or watery diarrhea with cramps. Sometimes a low-grade fever chills, and body aches occur.
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