Restaurants in Washington and Oregon purchased these oysters and they could have been distributed to other states. “The FDA is awaiting further information on distribution of these oysters and will continue to monitor the investigation and provide assistance to state authorities as needed,” the agency said.

The U.S. Food and Drug Administration is recalling oysters harvested from Puget Sound in December, citing possible norovirus contamination. It’s one of several recalls to impact the Pacific Northwest’s shellfish supply in the past month.

Norovirus is a contagious virus most commonly characterized by projectile vomiting and diarrhea. Other symptoms can include fever, headache and body aches. Noro