Differences in suppression of regrowth and resistance despite similar initial bacterial killing for meropenem and piperacillin/tazobactam against Pseudomonas aeruginosa and Escherichia coli

Differences in suppression of regrowth and resistance despite similar initial bacterial killing for meropenem and piperacillin/tazobactam against Pseudomonas aeruginosa and Escherichia coli

We described bacterial killing and resistance emergence at various fixed concentrations of meropenem and piperacillin/tazobactam against Pseudomonas aeruginosa and Escherichia coli. Time-kill studies were conducted utilizing nine isolates and a large range of concentrations. Within each strain and a...

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Veröffentlicht in:Diagnostic microbiology and infectious disease 2018-05, Vol.91 (1), p.69-76
Hauptverfasser: Bergen, Phillip J., Bulitta, Jürgen B., Sime, Fekade B., Lipman, Jeffrey, McGregor, Megan J., Millen, Nada, Paterson, David L., Kirkpatrick, Carl M.J., Roberts, Jason A., Landersdorfer, Cornelia B.
Format: Artikel
Sprache:eng
Schlagworte:
Bacterial killing
beta-Lactam antibiotics
In vitro studies
Resistance
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Zusammenfassung:We described bacterial killing and resistance emergence at various fixed concentrations of meropenem and piperacillin/tazobactam against Pseudomonas aeruginosa and Escherichia coli. Time-kill studies were conducted utilizing nine isolates and a large range of concentrations. Within each strain and antibiotic, initial killing was similar, with concentrations ≥2×MIC. At many (strain-specific) concentrations causing substantial initial killing, regrowth occurred at 24-48h. For remaining concentrations, growth typically remained suppressed (
ISSN:0732-8893
1879-0070
DOI:10.1016/j.diagmicrobio.2017.12.019