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			 The move by the world's biggest fast-food chain addresses concerns 
			that the overuse of antibiotics vital to fighting human infections 
			in farm animals may diminish the drugs' effectiveness in people. 
 McDonald's becomes the biggest beef buyer to tackle the issue in 
			cattle, potentially creating a new standard for livestock producers 
			and threatening sales by drug companies such as Merck & Co and 
			Elanco Animal Health.
 
 "McDonald's iconic position and the fact that they're the largest 
			single global purchaser of beef make it hugely important," said 
			David Wallinga, a senior health adviser for the environmental group 
			Natural Resources Defense Council.
 
 McDonald's said it will measure the use of antibiotics in its 10 
			biggest markets, including the United States, and set targets to 
			curb their use by the end of 2020. The markets cover 85 percent of 
			the company's global beef supply chain.
 
 Under the McDonald's policy, medically important antibiotics cannot 
			be used to routinely prevent disease in food animals in the supply 
			chain.
 
			
			 
			
 The company does not expect the policy to raise hamburger prices, 
			although franchisees set their own menu prices, spokeswoman Lauren 
			Altmin said.
 
 Franchisees operate about 90 percent of McDonald's restaurants.
 
 The Animal Health Institute, which represents pharmaceutical 
			companies, said it supported "judicious" use of antibiotics and that 
			drug makers are developing alternatives.
 
 Merck did not respond to a request for comment.
 
 Elanco said a small portion of its portfolio includes medically 
			important feed-grade antibiotics. The drugs are used to treat 
			conditions such as liver abscesses and respiratory diseases, for 
			which there are not effective alternatives, spokeswoman Colleen Parr 
			Dekker said
 
 "It is important to ensure that policies do not move faster than 
			science," she said.
 
 
			
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			Bob Smith, an Oklahoma-based cattle veterinarian for Veterinary 
			Research and Consulting Services, said farmers have worked to cut 
			back on antibiotic use while keeping cattle healthy. The lack of 
			alternatives limits their options, however, when animals fall ill, 
			he said. 
			"We will need those medically important antibiotics in meat 
			production for a long, long time," Smith said. "We want to use those 
			wisely."
 The U.S. Food and Drug Administration last year said sales and 
			distribution of medically important antibiotics for food production 
			fell 14 percent from 2015 to 2016, the first decline in year-to-year 
			sales since the agency began collecting the data in 2009. Chicken 
			accounted for 6 percent of the sales, while swine and cattle came in 
			at 37 percent and 43 percent, respectively.
 
			Many restaurants and meat companies have moved away from using 
			antibiotics in chicken production in recent years, in part because 
			McDonald's did so. The Chicago-based chain has an outsize influence 
			on farm practices due to its size.
 Removing antibiotics from cattle is more difficult, experts said, 
			because the animals live longer than chickens and have more chances 
			to fall ill.
 
 Hamburger chain Wendy's Co a year ago said it would buy about 15 
			percent of its beef beginning in 2018 from producers that have 
			pledged to reduce by 20 percent their use of an antibiotic.
 
 "What McDonald's is doing will hopefully start to shift the industry 
			all together from over-using antibiotics," said Matt Wellington, 
			antibiotics program director for advocacy group U.S. PIRG.
 
 (Reporting by Tom Polansek in Chicago; Additional reporting by 
			Siddharth Cavale in Bengaluru; Editing by Leslie Adler)
 
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