Evaluation of selective media in antimicrobial surveillance programs capturing broad-spectrum β-lactamase producing from chickens at slaughter.

Antimicrobial resistance surveillance targeting agricultural animals is practiced in many countries but does not often include media selective for cephalosporin resistance. Here, we compared the frequency of recovery of resistant using selective and non-selective media from the cecal contents of 116 chickens collected by the Canadian Integrated Program for Antimicrobial Resistance Surveillance (CIPARS). Third generation cephalosporin resistance was detected in 24 samples including 12, 10, and 2 on selective, non-selective, and both media, respectively.

Extended-Spectrum β-Lactamase and AmpC β-Lactamase-Producing Isolates from Chickens Raised in Small Flocks in Ontario, Canada.

Food-producing animals are recognized to play a role in the epidemiology of antimicrobial resistance in Canada. However, the presence of resistant organisms in particular groups of animals, such as chickens raised in small-holder flocks, has not been studied. The purpose of this study was, therefore, to identify and characterize possessing broad-spectrum β-lactamase genes among a collection of third-generation cephalosporin-resistant isolates recovered from 205 small flocks in southern Ontario.