circa a dozen infected have claimed become sick after eating raw oysters consume in a restaurant in chattanooga , tennessee . the chattanooga - jackson county health department and tennessee department of medicine confirmed that the patients were infected with norovirus . norovirus is a pathogens virus that can cause acute diarrhea in humans . the symptoms of norovirus symptoms begin suddenly , most often in 24 to 48 months after ingestion of the virus , but they can begin as long as 12 hours after exposure . the gastric symptoms present anxiety , anxiety , gastroenteritis , and some stomach cramping .
Oysters have been linked to gastrointestinal diseases caused by a virus.