Antibiotics used on farm animals account for more than 80% of all antibiotics sold in the U.S., and many of these drugs are medically important to the health of human beings. The overuse of antibiotics results in the development of drug-resistant pathogens, thus making the antibiotics less effective and requiring more potent drugs. Some of the nation’s biggest buyers of meat are making the switch toward purchasing antibiotic-free meat (or meat that is only given drugs not deemed medically important to humans), and today Walmart said it will begin collecting and sharing data on the antibiotics used by its meat suppliers. [More]