The FDA said the contaminated oysters were harvested between July 1 and July 18 from two sites in the bay off Hyannis and Yarmouth.

Advisories recently released by the state Department of Public Health and the FDA are warning people not to eat some oysters harvested on Cape Cod.

The FDA is issuing multiple advisories for oysters and Manila clams that could be contaminated with norovirus, a serious gastrointestinal illness.

FDA Issues 4th Oyster Warning In 18 Days: Latest Advisory In Washington Over Norovirus Outbreaks By Antonio Pequeño IV, Forbes Staff. Pequeño is a breaking news reporter who covers tech and more.

The FDA also advised that shellfish can be a source of pathogens more generally, and the risk of cross-contamination of food processing equipment and the food processing environment must be averted.

The recall includes oysters for the half-shell market, shucked, frozen, breaded and postharvest processed oysters. All could pose a risk of norovirus, the FDA said.

The FDA has issued a warning against selling or buying oysters from Lewis Bay, Massachusetts, due to potential contamination with Campylobacter jejuni.