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- W2010231427 abstract "Ceftolozane/tazobactam is under clinical development for treatment of complicated intra-abdominal infections (IAI), complicated urinary tract infections (UTI) and ventilator-associated pneumonia. We evaluated the in vitro activity of ceftolozane/tazobactam and comparator agents tested against Gram-negative aerobic bacteria causing IAI and healthcare-associated UTI (HCA-UTI). The organisms were consecutively collected from January to December 2012 from 59 medical centers located in the United States (USA) and 15 European countries by the Program to Assess Ceftolozane/Tazobactam Susceptibility (PACTS). The collection included 809 organisms from IAI and 2474 organisms from HCA-UTI, and susceptibility testing was performed by reference broth microdilution methods as described by the Clinical and Laboratory Standards Institute (CLSI) M07-A9 document. Overall, Escherichia coli, Klebsiella pneumoniae and Pseudomonas aeruginosa were the most frequently isolated pathogens from both infection types. Ceftolozane/tazobactam was very active against E. coli (MIC50/90, 0.25/0.5 mg/L; 98.5–99.9% inhibited at an MIC of ≤8 mg/L) and retained activity against many of the multidrug-resistant (MDR; MIC50/90, 0.5/2–>32 mg/L) and ESBL-phenotype strains (MIC50/90, 0.5/2–32 mg/L). Ceftolozane/tazobactam was active against most K. pneumoniae strains (MIC50/90, 0.25/16 mg/L, 88.9–89.6% inhibited at an MIC of ≤8 mg/L), but some ESBL-phenotype (MIC50/90, 4–8/>32 mg/L) and MDR (MIC50/90, 16/>32 mg/L) isolates exhibited elevated MIC values. Ceftolozane/tazobactam was the most active agent tested against P. aeruginosa (MIC50/90, 0.5/4 mg/L; 93.4–95.7% inhibited at ≤8 mg/L) and retained potency against many MDR (MIC50/90, 2–4/>32 mg/L), ceftazidime-nonsusceptible (MIC50/90, 2–4/>32 mg/L) and meropenem-nonsusceptible (MIC50/90, 2/>32 mg/L) strains. Ceftolozane/tazobactam was also active against Klebsiella oxytoca (MIC50/90, ≤0.12–0.25/0.5–1 mg/L), Enterobacter spp. (MIC50/90, 0.25–0.5/4–8 mg/L), Citrobacter spp. (MIC50/90, 0.25/2–32 mg/L), Proteus mirabilis (MIC50/90, 0.5/0.5 mg/L), indole-positive Proteae (MIC50/90, 0.25/0.5–1 mg/L), and Serratia spp. (MIC50/90, 0.5/1–2 mg/L). In summary, ceftolozane/tazobactam demonstrated potent in vitro activity when tested against contemporary aerobic Gram-negative pathogens causing IAI and HCA-UTI in USA and European medical centers." @default.
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- W2010231427 date "2014-09-01" @default.
- W2010231427 modified "2023-10-16" @default.
- W2010231427 title "Ceftolozane/tazobactam activity tested against aerobic Gram-negative organisms isolated from intra-abdominal and urinary tract infections in European and United States hospitals (2012)" @default.
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- W2010231427 doi "https://doi.org/10.1016/j.jinf.2014.04.004" @default.
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