Symptoms of norovirus illness usually include nausea, vomiting, diarrhea, and some stomach cramping. Sometimes people also have a low-grade fever, chills, headache, muscle aches, and a general sense of tiredness. The illness often begins suddenly, and the infected person may feel very sick. In most people the illness is self-limiting with symptoms lasting for one or two days.

People who have eaten raw oysters harvested from the affected area during the specified dates and have had symptoms of norovirus infection are encouraged to contact their health care professionals and local health departments.

People with weak immune systems, including those affected by AIDS, chronic alcohol abuse, liver, stomach or blood disorders, cancer, diabetes, or kidney disease and those taking certain medications for rheumatoid arthritis or cancer chemotherapy, should avoid raw oyster consumption altogether, regardless of where the oysters are harvested.

www.cfsan.fda/seafood1.html or call FDA's Food Safety Hotline at 1-888-SAFEFOOD.

SOURCE U.S. Food and Drug Administration