Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 55, Issue 9, Pages 4443-4446Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.01513-10
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Escherichia coli isolate MEV, responsible for a bloodstream infection, was resistant to penicillins, cephalosporins, and ertapenem. Molecular and biochemical characterization revealed the production of a novel, chromosome-borne, extended- spectrum AmpC (ESAC) beta-lactamase with a Ser-282 duplication and increased carbapenemase activity. This study demonstrates for the first time that chromosome-borne ESAC beta-lactamases can contribute to the emergence of ertapenem resistance in E. coli clinical isolates.
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