The world's biggest restaurant chain, McDonald's, will stop US purchases of chicken injected with antibiotics important to human medicine.
Chicken served in the company's 14,000 US restaurants will be free of such antibiotics within two years, it said.
The move comes amid concerns that the overuse of antibiotics in chicken may affect the drugs' effectiveness in fighting diseases in people.
McDonald's has been battling to win back customers amid slowing sales.
Many poultry producers give their birds antibiotics to make them grow faster. But overuse of the drugs could lead to them becoming less effective in treating illness and disease in humans.
McDonald's worldwide like-for-like sales - which strip out the effect of new restaurants opening - fell by a more-than-expected 1.8% in January on the back of a supplier scandal in China.
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