Consumer concern over antibiotic resistance among humans traced in part to the use of antibiotics in animal feed moved several health and consumer organizations to sue the U.S. government.

The lawsuit in U.S. District Court in Manhattan asked the court to declare that the Food and Drug Administration (FDA) had violated federal law by failing to withdraw approval of using penicillin and tetracyclines in animal feed when animal health is not at stake.

According to the lawsuit, livestock producers have been adding low doses of antibiotics to the feed of healthy animals since the 1950s.

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