The FDA confirmed that the potentially contaminated raw oysters from British Columbia were distributed to Alaska, California, Illinois, Massachusetts, New York, and Washington.
The contaminated oysters, which may look, smell, and taste normal, are particularly dangerous to people with weak immune systems, children below five years old, and the elderly.
The warning from the FDA is in line with investigations conducted by the Public Health Agency of Canada, which found that raw oysters cause the outbreak of norovirus and gastrointestinal illnesses in three Canadian provinces.
The actual carrier of the virus that has infected the oysters, however, remains unknown, and investigations are still in place.
The latter should eliminate the contaminated oysters.