The oysters, harvested from Lewis Bay in July, were distributed to several states, according to the FDA.
Potentially contaminated oysters from Massachusetts were recalled, and the Food and Drug Administration is advising restaurants and consumers not to eat the oysters that have been distributed to several states.
In a press release, the state Department of Public Health said oysters harvested on July 1 and July 3 from two sites in Lewis Bay in Cape Cod were linked to four cases of campylobacter illness, a bacteria that makes people ill with diarrhea and other symptoms.
Health officials in Massachusetts were notified about the cases July 18, and the state Division of Marine Fisheries closed the harvest area a day later to begin a growing area investigation.
Two state-certified shellfish dealers, Island Creek Oysters and Chatham Shellfish Co., initiated the voluntary recall on all oysters harvested from the site from July 1 to July 18. Boston.com reached out to the two companies for comment, but did not hear back in time for publication.