In this Thursday, Aug. 8, 2019, file photo, chickens are shipped for processing in Morton, Miss. The use of antimicrobial washes and sprays is widespread in the U.S. chicken industry, with companies applying them to kill germs at various stages in the production process. The practice highlights concerns that Britain could be pressured to accept looser food safety standards when negotiating post-Brexit trade deals. (AP Photo/Rogelio V. Solis)
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