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Public Health Microbiology

Acquisition of Resistance to Extended-Spectrum Cephalosporins by Salmonella enterica subsp. enterica Serovar Newport and Escherichia coli in the Turkey Poult Intestinal Tract

C. Poppe, L. C. Martin, C. L. Gyles, R. Reid-Smith, P. Boerlin, S. A. McEwen, J. F. Prescott, K. R. Forward
C. Poppe
1Laboratory for Foodborne Zoonoses, Public Health Agency of Canada
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  • For correspondence: Cornelius_Poppe@hc-sc.gc.ca
L. C. Martin
1Laboratory for Foodborne Zoonoses, Public Health Agency of Canada
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C. L. Gyles
2Department of Pathobiology
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R. Reid-Smith
1Laboratory for Foodborne Zoonoses, Public Health Agency of Canada
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P. Boerlin
2Department of Pathobiology
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S. A. McEwen
3Department of Population Medicine, University of Guelph, Guelph, Ontario
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J. F. Prescott
2Department of Pathobiology
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K. R. Forward
4Dalhousie University and Queen Elizabeth II HSC, Halifax, Nova Scotia, Canada
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DOI: 10.1128/AEM.71.3.1184-1192.2005
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ABSTRACT

Salmonella enterica subsp. enterica serovar Newport resistant to the extended-spectrum cephalosporins (ESCs) and other antimicrobials causes septicemic salmonellosis in humans and animals and is increasingly isolated from humans, animals, foods, and environmental sources. Mechanisms whereby serovar Newport bacteria become resistant to ESCs and other classes of antimicrobials while inhabiting the intestinal tract are not well understood. The present study shows that 25.3% of serovar Newport strains isolated from the turkey poult intestinal tract after the animals were dosed with Escherichia coli harboring a large conjugative plasmid encoding the CMY-2 β-lactamase and other drug resistance determinants acquired the plasmid and its associated drug resistance genes. The conjugative plasmid containing the cmy-2 gene was transferred not only from the donor E. coli to Salmonella serovar Newport but also to another E. coli serotype present in the intestinal tract. Laboratory studies showed that the plasmid could be readily transferred between serovar Newport and E. coli intestinal isolates. Administration of a single dose of ceftiofur, used to prevent septicemic colibacillosis, to 1-day-old turkeys did not result in the isolation of ceftiofur-resistant E. coli or Salmonella serovar Newport. There was a remarkable association between serotype, drug resistance, and plasmid profile among the E. coli strains isolated from the poults. This study shows that Salmonella serovar Newport can become resistant to ESCs and other antibiotics by acquiring a conjugative drug resistance plasmid from E. coli in the intestines.

  • Copyright © 2005 American Society for Microbiology
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Acquisition of Resistance to Extended-Spectrum Cephalosporins by Salmonella enterica subsp. enterica Serovar Newport and Escherichia coli in the Turkey Poult Intestinal Tract
C. Poppe, L. C. Martin, C. L. Gyles, R. Reid-Smith, P. Boerlin, S. A. McEwen, J. F. Prescott, K. R. Forward
Applied and Environmental Microbiology Mar 2005, 71 (3) 1184-1192; DOI: 10.1128/AEM.71.3.1184-1192.2005

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Acquisition of Resistance to Extended-Spectrum Cephalosporins by Salmonella enterica subsp. enterica Serovar Newport and Escherichia coli in the Turkey Poult Intestinal Tract
C. Poppe, L. C. Martin, C. L. Gyles, R. Reid-Smith, P. Boerlin, S. A. McEwen, J. F. Prescott, K. R. Forward
Applied and Environmental Microbiology Mar 2005, 71 (3) 1184-1192; DOI: 10.1128/AEM.71.3.1184-1192.2005
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KEYWORDS

Cephalosporin Resistance
Escherichia coli
Salmonella enterica
Turkeys

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