Cattle graze in a field near Sacramento, Calif. California Gov. Jerry Brown, along with many health advocacy groups, has called the overuse of antibiotics "an urgent public health problem." Rich Pedroncelli/AP hide caption

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The antibiotic resistant bacteria have been found in pigs, pork and people in China. This pig is from a farm on the outskirts of Beijing. Peter Parks/AFP/Getty Images hide caption

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Diners wait in line at a Subway sandwich shop on September 15, 2015 in Chicago, Ill. Subway will serve antibiotic-free turkey and chicken by the end of 2016, but it may take nine years for its suppliers of beef and pork to go antibiotic-free as well. Scott Olson/Getty Images hide caption

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Penicillin became a wonder drug for fighting infections in the 1940s. Jean-Claude Fide was an early adapter, injected in 1948 in the French town of Mont-pres-Chambord. Bert Hardy/Picture Post/Getty Images hide caption

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Patients receive treatment at the Chest Disease Hospital in Srinagar, India. The country has one of the highest rates of drug-resistant tuberculosis in the world, in part because antibiotics for the disease are poorly regulated by the government. Dar Yasin/AP hide caption

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Tyson Foods says it has already reduced its use of human-use antibiotics by 80 percent over the past four years. Here, Tyson frozen chicken on display at Piazza's market in Palo Alto, Calif., in 2010. Paul Sakuma/AP hide caption

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The European Union banned the use of antibiotics to boost animals' growth in 2006. At first, the ban had little effect on the amount of drugs given to pigs. Carsten Rehder/Corbis hide caption

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An order of McDonald's Chicken McNuggets in Olmsted Falls, Ohio. McDonald's says it plans to start using chicken raised without antibiotics important to human medicine. Mark Duncan/AP hide caption

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An overgrowth of Clostridium difficile bacteria can inflame the colon with a life-threatening infection. Dr. David Phillips/Getty Images/Visuals Unlimited hide caption

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One form of carbapenem-resistant bacteria seen in culture. CRE bacteria are blamed for 600 deaths a year in the U.S. and can withstand treatment by virtually every kind of antibiotic. CDC hide caption

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