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

AI Article Synopsis

Article Abstract

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. Extended-spectrum β-lactamase (ESBL; CTX-M-1) positive strains were isolated from 26 out of 205 flocks (12.7%), whereas 39 strains possessing AmpC (CMY-2) were grown from 31 out of 205 flocks (15.1%). Pulsed-field gel electrophoresis (PFGE) revealed that the isolates were genetically heterogeneous. Further testing by multi-locus sequence typing confirmed that none of the PFGE-defined clusters belonged to ST131. Our results suggest that the dissemination of this resistance in bacteria isolated from chickens in small-holder flocks may be associated with the spread of plasmids rather than particular clones and that these isolates do not possess the ESBL types most commonly associated with human infections (CTX-M-15).

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Source
http://dx.doi.org/10.1089/mdr.2018.0406DOI Listing

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