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Diagn Microbiol Infect Dis. 2010 Jul;67(3):270-6. doi: 10.1016/j.diagmicrobio.2010.02.008. Epub 2010 May 11.

AmpC beta-lactamases in Escherichia coli: emergence of CMY-2-producing virulent phylogroup D isolates belonging mainly to STs 57, 115, 354, 393, and 420, and phylogroup B2 isolates belonging to the international clone O25b-ST131.

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1
Antibiotic Laboratory, Bacteriology Service, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain. jesus.oteo@isciii.es

Abstract

Cephalosporins resistance is increasing in Escherichia coli in Spain. We characterize infections by E. coli with reduced susceptibility to third-generation cephalosporins (3GCs) with the AmpC phenotype. Between January 2004 and March 2007, 121 E. coli isolates with the AmpC phenotype were collected (4.8% of all the 2538 E. coli isolates with reduced susceptibility to 3GCs). These isolates were further characterized by clinical and molecular analysis. Plasmid-encoded ampC genes were detected in 46 (38%) isolates (43 CMY-2); 75 isolates (62%) had modifications in the chromosomal ampC promoter region (c-AmpC). CMY-2 producers belonged primarily to the more virulent phylogroup D (48.4%), whereas most isolates of c-AmpC belonged to phylogroup A (56.4%). Bacteremia and infections in children were more frequently produced by CMY-2 producers. CMY-2-producing phylogroup D E. coli belonged to 8 multilocus sequence typing types. Three CMY-2 producers belonged to O25b/ST131/B2 clone. Infections caused by E. coli with the AmpC phenotype may be spreading primarily because of CMY-2-producing phylogroup D isolates, although this enzyme was also detected in the O25b/ST131/B2 clone.

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