High prevalence of ST131 isolates producing CTX-M-15 and CTX-M-14 among extended-spectrum-beta-lactamase-producing Escherichia coli isolates from Canada

Gisele Peirano, David Richardson, Jana Nigrin, Allison McGeer, Vivian Loo, Baldwin Toye, Michelle Alfa, Colette Pienaar, Pamela Kibsey, Johann D D Pitout
Antimicrobial Agents and Chemotherapy 2010, 54 (3): 1327-30
Phenotypic and genotypic methods were used to characterize extended-spectrum-beta-lactamase (ESBL)-producing Escherichia coli isolated in 2007 from 11 different Canadian medical centers. Of the 209 ESBL-producing E. coli isolates tested, 148 (71%) produced CTX-M-15, 17 (8%) produced CTX-M-14, 5 (2%) produced CTX-M-3, and 1 produced CTX-M-27. Overall, 96 (46%) of the ESBL producers belonged to clonal complex ST131, with the highest prevalence in Brampton, Calgary, and Winnipeg. ST131 is an important cause of community onset urinary tract infections due to ESBL-producing E. coli across Canada.

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