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The fast food company said it will now use "no antibiotics important to human medicine" beginning in spring of this year. The company first said it would stop using antibiotics in 2014.
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The World Health Organization is calling for strict limits on antibiotic use in animals raised for food. The guidelines could push many countries, including the U.S., to restrict drug use on farms.
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The germs caused a urinary tract infection in a Pennsylvania woman that was difficult to treat. The bacteria were resistant to the drug often used as the last-ditch treatment, but another one worked.
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Researchers are trying to figure out whether probiotics — the stuff we like to eat in yogurt to keep our guts healthy — could also help pigs, cows and chickens thrive.
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Antibiotic use is falling out of fashion in the poultry industry. Tyson Foods, the biggest poultry producer in the U.S., says it will stop feeding its birds human-use antibiotics in two years.