Portions of the data from this study were presented at the 105th General meeting of American Society of Microbiology (ASM), Atlanta, GA, June 2005.
Characterization of antimicrobial resistant Escherichia coli isolated from processed bison carcasses
Article first published online: 5 JUL 2007
Journal of Applied Microbiology
Volume 103, Issue 6, pages 2361–2369, December 2007
How to Cite
Li, Q., Sherwood, J.S. and Logue, C.M. (2007), Characterization of antimicrobial resistant Escherichia coli isolated from processed bison carcasses. Journal of Applied Microbiology, 103: 2361–2369. doi: 10.1111/j.1365-2672.2007.03470.x
- Issue published online: 5 JUL 2007
- Article first published online: 5 JUL 2007
- 2006/1553: received 7 November 2006, revised 16 April 2007 and accepted 18 May 2007
- antimicrobial resistance genes;
- antimicrobial susceptibility;
- Escherichia coli;
- pulsed field gel electrophoresis
Aim: To determine the phenotypic and genotypic antimicrobial susceptibility profiles of Escherichia coli from bison carcasses.
Methods and Materials: The antimicrobial resistance of 138 E. coli isolates recovered from processed bison carcasses was determined by using the National Antimicrobial Resistance Monitoring System panels, polymerase chain reaction assays, plasmid analysis and conjugation studies.
Results: Resistance to 14 of the 16 antimicrobials was observed. Twenty-three (16·7%) isolates displayed resistance to at least one antimicrobial agent. The most prevalent resistances were to tetracycline (13·0%), sulfamethoxazole (7·9%) and streptomycin (5·8%). No resistance was observed to amikacin and ciprofloxacin. Further analysis of 23 antimicrobial-resistant E. coli isolates showed the presence of resistance genes corresponding to their phenotypic profiles. Results of conjugation studies carried out showed most isolates tested were able to transfer their resistance to recipients.
Conclusion: This study indicated that multidrug-resistant E. coli isolates are present in bison. However, the resistance rate is lower than that reported in other meat species.
Significance and Impact of the Study: The beneficial effects of antimicrobial-free feeding practice in bison may be promoting a reduction in the prevalence of antimicrobial resistance in commensal flora of bison.