The HPAI virus is believed to spread partly by migratory wild birds, posing the risk that it may reach other farms. (Dan Gleiter/ via AP, Pool)

(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.

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