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Antimicrobial activity of ceftolozane-tazobactam tested against Enterobacteriaceae and Pseudomonas aeruginosa collected from patients with bloodstream infections isolated in United States hospitals (2013-2015) as part of the Program to Assess Ceftolozane-Tazobactam Susceptibility (PACTS) surveillance program.
Diagnostic Microbiology and Infectious Disease 2018 October
This study evaluated the in vitro activity of ceftolozane-tazobactam and comparators against 2647 Enterobacteriaceae and 355 Pseudomonas aeruginosa nonduplicate isolates collected from hospitalized patients with bloodstream infections in US hospitals from 2013 to 2015.Ceftolozane-tazobactam (95.5% susceptible), amikacin (99.2% susceptible), and meropenem (98.4% susceptible) were the most active against Enterobacteriaceae. For Enterobacteriaceae, 1.4% (n = 37) were carbapenem-resistant (CRE), and 10.2% (n = 271) exhibited an extended-spectrum β-lactamase (ESBL) non-CRE phenotype. The most common ESBL enzyme detected was blaCTX-M-15 -like (n = 159). Whereas ceftolozane-tazobactam showed good activity against ESBL non-CRE phenotype Enterobacteriaceae (87.1% susceptible), it lacked useful activity against CRE strains. Ceftolozane-tazobactam was the most potent (MIC50/90 , 0.5/1 mg/L) β-lactam agent tested against P. aeruginosa isolates, with 97.5% susceptible. Only colistin was more active (98.9% susceptible). Ceftolozane-tazobactam was the most active β-lactam agent tested against P. aeruginosa and demonstrated higher in vitro activity than available cephalosporins and piperacillin-tazobactam when tested against Enterobacteriaceae.
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