The U.S. FDA has officially banned all shellfish from South Korea– including oysters, clams, mussels, and scallops.  The decision came after an analysis of Korean shellfish detected high water pollution and traces of highly-contagious norovirus, which sickens humans who eat contaminated food.

Anyone who has recently bought molluscan shellfish should contact the retailer to inquire about its origin, health officials said. The label on seafood that comes in bags, cans or other packages should indicate the country of origin.