The Louisiana state Department of Health and Hospitals has closed a large section of east bank Plaquemines Parish waters to oyster fishing through at least mid-April, after 11 people in Mississippi – at a seafood conference, repeat, at a seafood conference — became sick after eating oysters believed to be traced to that area.

The Times-Picayune reports the state has also issued a recall of any oysters harvested from that area since March 6, meaning wholesalers must review their records and contact any restaurants, brokers or other buyers who bought oysters from those waters. Under Food and Drug Administration and state health guidelines, oyster dealers are required to have a recall plan in effect.