|Dargatz, David - USDA-APHIS|
Submitted to: Journal of Applied Microbiology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: January 28, 2005
Publication Date: August 1, 2005
Citation: Englen, M.D., Cray, P.J., Ladely, S.R., Dargatz, D.A. 2005. Antimicrobial resistance patterns of Campylobacter from feedlot cattle. Journal of Applied Microbiology. 99(2):285-291. Interpretive Summary: The emergence of bacterial pathogens resistant to antimicrobials used to treat human disease has provoked controversy over the use of such drugs in food animal production. We determined the resistance patterns to twelve antimicrobials among a geographically diverse group of the food-borne pathogen, Campylobacter, isolated from feedlot cattle. Major findings included 55% resistant to one or more antimicrobials, and nearly 14% resistant to two or more agents. Much of the resistance was accounted for by tetracycline, nalidixic acid and ciprofloxacin. Tetracycline, and to a lesser degree ciprofloxacin, is used in feedlot cattle. However, although macrolides such as erythromycin are also widely used, we found very low levels of resistance to these antimicrobials. This work will be useful to beef producers, regulatory agencies and researchers studying antimicrobial resistance, providing valuable new information on resistance in an important pathogen from a major sector of the US food supply.