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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 blaCMY 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 exhibited decreased susceptibilities to ceftiofur and ceftriaxone were shown to possess a blaCMY gene. The blaCMY-4 gene was identified in an E. coli isolate recovered from retail chicken and was further shown to be responsible for resistance to cephalothin, ampicillin, and amoxicillin-clavulanic acid and elevated MICs of ceftriaxone, cefoxitin, and ceftiofur.

* 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.

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.


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