Identification of Extended-Spectrum AmpC and Carbapenem- Hydrolyzing β-Lactamases in Escherichia coli and Klebsiella pneumoniae by Disk Tests

摘要

Antibiotic disks with and without clavulanic acid, 3-aminophenylboronic acid, or EDTA were tested with a set of 55 Klebsiella pneumoniae and Escherichia coli strains producing well-characterized extended-spectrum, AmpC, or carbapenem-hydrolyzing β-lactamases. A relatively simple scheme was devised for distinguishing β-lactamase types in clinical isolates with or without intact outer membrane porins.