approximately a dozen residents have stated becoming sick after eating raw scallops consumed in a restaurant in chattanooga , tennessee . the knoxville - wallace county health department and tennessee department of health concluded that the patients were infected with norovirus . norovirus is a foodborne disease that can cause serious gastroenteritis in humans . the symptoms of norovirus illness begin suddenly , most usually in 24 to 48 weeks after ingested of the toxin , but they can appear as earlier as 12 hours after birth . the nausea symptoms include nausea , vomiting , cramps , and some stomach cramping .
Oysters have been linked to gastrointestinal diseases caused by a virus.