Antimicrobial Resistance in Escherichia coli Isolated from Retail Milk-Fed Veal Meat from Southern Ontario, Canada

Authors: Cook, Angela¹; Reid-Smith, Richard J.²; Irwin, Rebecca J.³; McEwen, Scott A.⁴; Young, Virginia³; Butt, Kelly⁴; Ribble, Carl⁵

Source: Journal of Food Protection®, Volume 74, Number 8, August 2011 , pp. 1328-1333(6)

Publisher: International Association for Food Protection

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Abstract:

This study estimated the prevalence of Escherichia coli isolates in fresh retail milk-fed veal scallopini pieces obtained from grocery stores in Ontario, Canada. In addition, the prevalence and antimicrobial resistance patterns were examined for points of public health significance. One hundred fifty-three milk-fed veal samples were collected over the course of two sampling phases, January to May 2004 and November 2004 to January 2005. E. coli isolates were recovered from 87% (95% confidence interval, 80.54 to 91.83%) of samples, and antimicrobial susceptibility testing was conducted on 392 isolates. The prevalence of resistance to one or more antimicrobials was 70% (274 of 392), while the resistance to five or more antimicrobials was 33% (128 of 392). Resistance to ceftiofur (2.8%), ceftriaxone (3.6%), nalidixic acid (12%), and ciprofloxacin (3.8%) alone or in combination was observed. Eighty-five resistance patterns were observed; resistance to tetracycline only (7.4%) was observed most frequently. Individual antimicrobial resistance prevalence levels were compared with grain-fed veal and retail beef data from samples collected in Ontario. In general, resistance to individual antimicrobials was observed more frequently in E. coli isolates from milk-fed veal than in isolates from grain-fed veal and beef. Resistance to one or more antimicrobials and to five or more antimicrobials in E. coli isolates was more frequent in isolates from milk-fed veal than in isolates from grain-fed veal and beef. This study provides baseline data on the occurrence of resistance in E. coli isolates from milk-fed veal that can be compared with data for other commodities. Additionally, E. coli resistance patterns may serve as an indicator of antimicrobial exposure.

Document Type: Research article

DOI: http://dx.doi.org/10.4315/0362-028X.JFP-10-495

Affiliations: 1: Laboratory for Foodborne Zoonoses, Public Health Agency of Canada, 120-255 Woodlawn Road West, Guelph, Ontario, Canada N1H 8J1; Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada N1G 1P7. angela.cook@phac-aspc.gc.ca 2: Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada N1G 1P7; Laboratory for Foodborne Zoonoses, Public Health Agency of Canada, 103-160 Research Lane, Guelph, Ontario, Canada N1G 5B2 3: Laboratory for Foodborne Zoonoses, Public Health Agency of Canada, 103-160 Research Lane, Guelph, Ontario, Canada N1G 5B2 4: Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada N1G 1P7 5: Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada N1G 1P7; Department of Ecosystem & Public Health, Faculty of Veterinary Medicine, University of Calgary, TRW 2D22; 3330 Hospital Drive N.W., Calgary, Alberta, Canada T2N 2Z6.

Publication date: 2011-08-01

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First published in 1937, the Journal of Food Protection^®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection^® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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Antimicrobial Resistance in Escherichia coli Isolated from Retail Milk-Fed Veal Meat from Southern Ontario, Canada

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