Identification and Expression of Cephamycinase blaCMY Genes in Escherichia coli and Salmonella Isolates from Food Animals and Ground Meat

doi:10.1128/AAC.45.12.3647-3650.2001

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Antimicrobial Agents and Chemotherapy, December 2001, p. 3647-3650, Vol. 45, No. 12
0066-4804/01/$04.00+0 DOI: 10.1128/AAC.45.12.3647-3650.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Identification and Expression of Cephamycinase bla_CMY Genes in Escherichia coli and Salmonella Isolates from Food Animals and Ground Meat

Shaohua Zhao,¹^,^* David G. White,¹ Patrick F. McDermott,¹ Sharon Friedman,¹ Linda English,¹ Sherry Ayers,¹ Jianghong Meng,² John J Maurer,³ Robert Holland,⁴ and Robert D. Walker¹

Division of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland 20708¹; Department of Nutrition and Food Science, University of Maryland, College Park, Maryland 20742²; Department of Avian Medicine, University of Georgia, Athens, Georgia, 30602³; and Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, Iowa 50011⁴

Received 7 March 2001/Returned for modification 17 August 2001/Accepted 20 September 2001

Twenty-one Salmonella and 54 Escherichia coli isolates, recovered from food animals and retail ground meats, that exhibiteddecreased susceptibilities to ceftiofur and ceftriaxone were shownto possess a bla_CMY gene. The bla_CMY-4 gene was identifiedin an E. coli isolate recovered from retail chicken and was furthershown to be responsible for resistance to cephalothin, ampicillin,and amoxicillin-clavulanic acid and elevated MICs of ceftriaxone,cefoxitin, andceftiofur.

^* Corresponding author. Mailing address: Office of Research, U.S. FDA/CVM, 8401 Muirkirk Rd., Laurel, MD 20708. Phone: (301)827-8139. Fax: (301) 827-8127. E-mail: szhao{at}cvm.fda.gov.

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