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Foodborne Pathog Dis. 2011 Feb;8(2):329-32. doi: 10.1089/fpd.2010.0619. Epub 2010 Oct 25.

Commensal Escherichia coli isolate resistant to eight classes of antimicrobial agents in the United States.

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  • 1Division of Foodborne, Waterborne, and Environmental Diseases, National Center for Enteric, Zoonotic, and Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.


To increase understanding of community-acquired resistance, stool samples from 477 nonhospitalized persons in Maryland and Michigan, from 2004 to 2008, were screened for ceftriaxone resistance. Seven (1.5%) yielded ceftriaxone-resistant Escherichia coli; one isolate was resistant to all eight antimicrobial classes routinely tested: aminoglycosides, β-lactam/β-lactamase inhibitor combinations, cephems, penicillins, folate pathway inhibitors, phenicols, quinolones, and tetracyclines. The extensively resistant isolate was from a 50-year-old woman who denied antimicrobial use, hospitalization, or international travel within 6 months. Meat (beef, chicken, and pork) and eggs were consumed within 1 month before stool collection. Further studies are warranted to understand potential sources, including the food supply, of resistant E. coli.

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