The in vitro activity of ceftazidime in combination with NXL104 versus 470 Pseudomonas aeruginosa clinical isolates was evaluated using Clinical and Laboratory Standards Institute (CLSI) broth microdilution methods. Ceftazidime had MIC90s of 8 μg/ml and 32 μg/ml in the presence and absence of NXL104, respectively. Of 25 multidrug-resistant P. aeruginosa isolates, the percentages with a ceftazidime MIC of ≤8 μg/ml with and without NXL104 were 60% and 4%, respectively. These data suggest that the ceftazidime-NXL104 combination may prove useful for treating many P. aeruginosa infections
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