Inhibitor-based Methods for Detection of Plasmid-mediated AmpC Beta-lactamases in Klebsiella Spp., Escherichia Coli, and Proteus Mirabilis

Overview

Journal J Clin Microbiol

Specialty Microbiology

Date 2005 Aug 6

PMID 16081966

Citations 68

Authors

Philip E Coudron

Affiliations

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Abstract

Non-beta-lactam inhibitor-based methods were evaluated for detecting plasmid-mediated AmpC beta-lactamases in Klebsiella spp., Escherichia coli, and Proteus mirabilis. Using CLSI methodology and disks containing cefotetan alone and in combination with 400 mug of boronic acid, 9 of 10 positive control strains and 54 of 55 AmpC-PCR-positive clinical isolates were detected. Importantly 71% and 40% of these clinical isolates were susceptible by routine testing to ceftriaxone and ceftazidime, respectively. Boronic acid disks also enhanced detection of expanded-spectrum beta-lactamases in AmpC producers.

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