In vitro-in vivo discordance with humanized piperacillin-tazobactam exposures against piperacillin-tazobactam-resistant/pan-β-lactam-susceptible Escherichia coli

M. L. Monogue; D. P. Nicolau

doi:10.1128/AAC.01208-16

In vitro-in vivo discordance with humanized piperacillin-tazobactam exposures against piperacillin-tazobactam-resistant/pan-β-lactam-susceptible Escherichia coli

M. L. Monogue, D. P. Nicolau

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Recent findings have identified Escherichia coli strains that are pan-β-lactam susceptible (PBL-S) but piperacillin-tazobactam resistant (TZP-R) in vitro. We assessed the in vivo significance of this resistance profile in a neutropenic murine pneumonia model using humanized exposures of TZP with 18 clinical E. coli isolates, 8 TZP-S/PBL-S and 10 genotypically confirmed TZP-R/PBL-S. Despite phenotypically and genotypically defined resistance, TZP displayed efficacy against these isolates. Additional studies are required to define the clinical implications of these TZP-R/PBL-S strains.

Original language	English (US)
Pages (from-to)	7527-7529
Number of pages	3
Journal	Antimicrobial agents and chemotherapy
Volume	60
Issue number	12
DOIs	https://doi.org/10.1128/AAC.01208-16
State	Published - Dec 2016
Externally published	Yes

ASJC Scopus subject areas

Pharmacology
Pharmacology (medical)
Infectious Diseases

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abstract = "Recent findings have identified Escherichia coli strains that are pan-β-lactam susceptible (PBL-S) but piperacillin-tazobactam resistant (TZP-R) in vitro. We assessed the in vivo significance of this resistance profile in a neutropenic murine pneumonia model using humanized exposures of TZP with 18 clinical E. coli isolates, 8 TZP-S/PBL-S and 10 genotypically confirmed TZP-R/PBL-S. Despite phenotypically and genotypically defined resistance, TZP displayed efficacy against these isolates. Additional studies are required to define the clinical implications of these TZP-R/PBL-S strains.",

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AB - Recent findings have identified Escherichia coli strains that are pan-β-lactam susceptible (PBL-S) but piperacillin-tazobactam resistant (TZP-R) in vitro. We assessed the in vivo significance of this resistance profile in a neutropenic murine pneumonia model using humanized exposures of TZP with 18 clinical E. coli isolates, 8 TZP-S/PBL-S and 10 genotypically confirmed TZP-R/PBL-S. Despite phenotypically and genotypically defined resistance, TZP displayed efficacy against these isolates. Additional studies are required to define the clinical implications of these TZP-R/PBL-S strains.

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In vitro-in vivo discordance with humanized piperacillin-tazobactam exposures against piperacillin-tazobactam-resistant/pan-β-lactam-susceptible Escherichia coli

Abstract

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