Antimicrobial Resistance Surveillance in Swine E. coli, Pasteurella multocida and Streptococcus suis Isolates from Ontario

Clusters of increased multiple-class antibiotic resistance have been found in Pasteurella bacteria in pigs in Ontario, Canada in the spring of 2004 by researchers at the University of Guelph. They linked this with an outbreak of porcine circovirus disease in the autumn of that year.
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The objective of this work, reported by Shiona K. Glass-Kaastra of the University of Guelph, Canada, and other in Preventative Veterinary Medicine, was to describe trends in multiple-class antimicrobial resistance present in clinical isolates of Escherichia coli F4, Pasteurella multocida and Streptococcus suis from Ontario swine 1998–2010. Also examined were the impacts of the 2004–2006 Porcine Circovirus type-2 Associated Disease (PCVAD or PMWS) outbreak.

Temporal changes in multiple-class resistance varied by the pathogens examined; significant yearly changes were apparent for the E. coli and P. multocida data.

Although not present in the E. coli data, significant increases in multiple-class resistance within P. multocida isolates occurred from 2003 to 2005, coinciding with the expected increase in antimicrobials used to treat clinical signs of PCVAD before it was confirmed.

Prospective temporal scan statistics for multiple-class resistance suggest that significant clusters of increased resistance may have been found in the spring of 2004, just months before the identification of the PCVAD outbreak in the fall of 2004.


Glass-Kaastra S.K., D.L. Pearl, R. Reid-Smith, B. McEwen, D. Slavic, J. Fairles and S.A. McEwen. 2014. Multiple-class antimicrobial resistance surveillance in swine Escherichia coli F4, Pasteurella multocida and Streptococcus suis isolates from Ontario and the impact of the 2004–2006 Porcine Circovirus type-2 Associated Disease outbreak. Preventive Veterinary Medicine. 113(2):159–164.

Further Reading

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February 2014

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