The nation’s large retailers, such as Homeplus and Lotte Mart, temporarily suspended sales of U.S. beef on Wednesday following an outbreak of mad cow disease in California.

The suspension came a day after the U.S. Department of Agriculture reported the country’s fourth-ever case of bovine spongiform encephalopathy, or BSE.

But U.S. officials said the outbreak was contained and no contaminated meat had entered the food chain, stressing that it poses no threat to consumers.

A spokesperson for Korea’s Ministry of Food, Agriculture, Forestry and Fisheries said it will strengthen quarantine checks on U.S. beef imports and take other necessary emergency measures

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