Dispensing antibiotics to healthy animals is routine on the large, concentrated farms that now dominate American agriculture. But the practice is increasingly condemned by medical experts who say it contributes to a growing scourge of modern medicine: the emergence of antibiotic-resistant bacteria, including dangerous E. coli strains that account for millions of bladder infections each year, as well as resistant types of salmonella and other microbes.
Why?
As drug-resistant strains of microbes evolve on the farms, they are passed along in meat sold in grocery stores. They can infect people as they handle the uncooked product or when eating, if cooking is not thorough. The dangerous strains can also enter the environment via manure or the clothes of farm workers.
