Abstract

A total of 84,704 isolates were collected from 191 medical centers in 2009 to 2013 and tested for susceptibility to ceftaroline and comparator agents by broth microdilution methods. Ceftaroline inhibited all Staphylococcus aureus isolates at ≤2 μg/ml and was very active against methicillin-resistant strains (MIC at which 90% of the isolates tested are inhibited [MIC90], 1 μg/ml; 97.6% susceptible). Among Streptococcus pneumoniae isolates, the highest ceftaroline MIC was 0.5 μg/ml, and ceftaroline activity against the most common Enterobacteriaceae species (MIC50, 0.12 μg/ml; 78.9% susceptible) was similar to that of ceftriaxone (MIC50, ≤0.25 μg/ml; 86.8% susceptible).

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