Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 50, Issue 9, Pages 3179-3182Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.00218-06
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Three episodes of bacteremia occurred in the course of prosthetic valve endocarditis caused by an extended-spectrum-beta-lactamase (ESBL)-producing Klebsiella pneumoniae strain. The second isolate developed resistance to ciprofloxacin and the third isolate to piperacillin-tazobactam (PIP-TZ) following sequential therapy with each agent. The first isolate was resistant to PIP-TZ only at high inocula, the second isolate acquired increased transcription of the acrA gene, and the third isolate became resistant to PIP-TZ due to loss of P-lactamase inhibition by TZ. We question if and how PIP-TZ susceptibility should be reported for ESBL-producing Enterobacteriaceae.
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