(Bloomberg) – A deadly form of bird flu has been confirmed in a southern Tennessee operation that supplies Tyson Foods Inc. with chickens, marking the first U.S. case at a commercial farm this year and prompting South Korea to ban imports of American poultry.

Highly-pathogenic H7 avian influenza, or HPAI, was found in a breeding flock of 73,500 chickens in Lincoln County, the U.S. Department of Agriculture's Animal and Plant Health Inspection Service said in a statement Sunday. The site has been placed under quarantine and the flock will be destroyed to prevent the disease's spread. No birds will enter the food system, the agency said.

Limited scope of disruption

"Based on the limited scope known to us at this time, we don't expect disruptions to our chicken business and plan to meet our customers' needs," Worth Sparkman, a spokesman for Tyson, the largest U.S. chicken producer, said in an email Monday.

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