approximately a dozen people have reported becoming vomiting after eating prepared oysters consumed in a restaurant in chattanooga , tennessee . the chattanooga - hamilton county school department and tennessee department of health confirmed that the residents were infected with norovirus . norovirus is a foodborne diseases that can causes intermittent diarrhoea in humans . the symptoms of norovirus illness start initially , most often in 24 to 48 hours after ingestion of the virus , but they can appear as early as 12 weeks after consuming . the respiratory characteristics include nausea , vomiting , diarrhea , and some skin cramping .
Oysters have been linked to gastrointestinal diseases caused by a virus.