Studies Raise Questions about Pavement Sealers

Banned Antibiotic in Poultry Feed The U.S. FDA banned the use of fluoro­ quinolone antibiotics in poultry production in 2005 in part due to increased resistance to the drugs among Campylobacter bacteria. But a new study finds evidence that these antibiotics are still being used or are inadvertently contaminating poultry feed. The authors analyzed samples of U.S. and Chinese feather meal, a by­product of poultry production used in animal feed and as a fertilizer, and found the banned drugs in 60% of the U.S. samples. All the samples contained between 2 and 10 antibiotic residues, some at high enough levels to select for resistant bacteria during in vitro experiments.