In Vitro Discordance with In Vivo Activity: Humanized Exposures of Ceftazidime-Avibactam, Aztreonam, and Tigecycline Alone and in Combination against New Delhi Metallo-β-Lactamase-Producing Klebsiella pneumoniae in a Murine Lung Infection Model
- 1 July 2017
- journal article
- Published by American Society for Microbiology in Antimicrobial Agents and Chemotherapy
- Vol. 61 (7)
- https://doi.org/10.1128/aac.00486-17
Abstract
The management of infections with New Delhi metallo-beta-lactamase-1 (NDM)-producing bacteria remains clinically challenging given the multidrug resistant (MDR) phenotype associated with these bacteria. Despite resistance in vitro , ceftazidime-avibactam previously demonstrated in vivo activity against NDM-positive Enterobacteriaceae . Herein, we observed in vitro synergy with ceftazidime-avibactam and aztreonam against an MDR Klebsiella pneumoniae harboring NDM. In vivo , humanized doses of ceftazidime-avibactam monotherapy resulted in >2 log 10 CFU bacterial reduction; therefore, no in vivo synergy was observed.Funding Information
- Louis Stokes Cleveland Department of Veterans Affairs Medical Center (1I01BX001974)
- HHS | NIH | National Institute of Allergy and Infectious Diseases (R01AI063517, R01AI072219, R01AI100560)
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