The feed tickets examined represent a fraction of the tens of thousands issued annually to poultry farms run by or for major producers. Some of its feed has contained low levels of one antibiotic, feed tickets show. REUTERS/Randall Hill MODERN BARN: Nearly 20,000 broiler chicks are housed inside a Foster Farms chicken ranch in Stanislaus County, California. As the CDC studied what investigators informally called the “Foster Farms Outbreak,” researchers soon made a troubling discovery. Reuters asked to see Foster Farms’ feed tickets from that period; the company didn’t respond to that request.

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