approximately a dozen individuals have reported becoming vomiting after buying raw oysters consumed in a restaurant in hyderabad , tennessee . the chattanooga - henderson local government department and tennessee department of health confirmed that the patients were injected with norovirus . norovirus is a foodborne parasite that can cause complex gastroenteritis in humans . the symptoms of norovirus illness start suddenly , most often in 24 to 48 hours after excreted of the infection , but they can resolve as early as 12 hours after introduction . the gastrointestinal symptoms include discomfort , vomit , diarrhea , and some stomach diarrhea .
Oysters have been linked to gastrointestinal diseases caused by a virus.