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

toggle caption Scott Olson/Getty Images

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

toggle caption Joe Raedle/Getty Images

No chicken, organic or conventionally raised, is completely free of pathogens. Seth Perlman/AP hide caption

toggle caption Seth Perlman/AP

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

toggle caption Danny Johnston/AP

NPR thanks our sponsors

Become an NPR sponsor