"There's a heated debate over the use of antibiotics in farm animals. Critics say farmers overuse these drugs; farmers say they don't. It's hard to resolve the argument, in part because no one knows exactly how farmers use antibiotics."

"There's no reliable data on how much antibiotic use is intended to make animals grow faster, for instance, compared to treating disease. Many public health experts say the government should collect and publish that information because antibiotic-resistant bacteria are an increasingly urgent problem. But many farm groups are opposed.

James Johnson, a professor of medicine and infectious disease at the University of Minnesota, is among those pushing for better data. He faces the problem of drug-resistant bacteria firsthand. When he prescribes antibiotics to patients, he increasingly has to ask himself, "Will this drug even work?""

Dan Charles reports for NPR's All Things Considered August 29, 2013. [2]