Sources of variation in the ampicillin-resistant Escherichia coli concentration in the feces of organic broiler chickens.


Currently, there are limited published data for the population dynamics of antimicrobial-resistant commensal bacteria. This study was designed to evaluate both the proportions of the Escherichia coli populations that are resistant to ampicillin at the level of the individual chicken on commercial broiler farms and the feasibility of obtaining repeated… (More)