Many livestock groups say there's no evidence that antibiotics in livestock feed have caused a human health problem, but researchers beg to differ. Scott Olson/Getty Images hide caption

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A holding pen for lambs at the Will-O-Wood Farm in southeastern Ohio. Meta Van Nostran hide caption

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Adrian Mesa protests the overuse of antibiotics in meat production outside a Burger King in Coral Gables, Fla. in 2003. Joe Raedle/Getty Images hide caption

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Jennie Grant greets her goat Eloise in Seattle. No stranger to urban farming, Grant already had chickens, bees, and a large vegetable garden before she added goats to her lineup. Elaine Thompson/AP hide caption

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A man with a cow in Dong Thap province in southern Vietnam. He got the cow from Heifer International — as well as training and resources to care for it. Courtesy of Juleen Lapporte hide caption

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A truckload of live turkeys arrives at the Cargill plant in Springdale, Ark., on Aug. 4. Most turkeys in the U.S. are given low doses of antibiotics, which breed resistant strains of bacteria, including Salmonella. Danny Johnston/AP hide caption

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