Reduced in vitro activity of ceftaroline by Etest among clonal complex 239 methicillin-resistant Staphylococcus aureus clinical strains from Australia

I. J. Abbott, A. W.J. Jenney, C. J. Jeremiah, M. Mirčeta, J. P. Kandiah, D. C. Holt, S. Y.C. Tong, D. W. Spelman

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A total of 421 methicillin-resistant Staphylococcus aureus (MRSA) clinical isolates were tested for ceftaroline susceptibility by Etest (bioMérieux). A multidrug resistant phenotype was found in 40.9%, and clonal complex 239 (CC239) was found in 33.5%. Ceftaroline nonsusceptibility (MIC, > 1.0 μg/ml) was 16.9% overall. Nonsusceptibility was significantly higher in CC239 (41.1%, 58/141) and in isolates with a multidrug resistant phenotype (35.5%, 61/172) compared with comparators (P<0.0001). Nonsusceptibility of common multidrug resistant MRSA clones limits the empirical use of ceftaroline for these infections.

Original languageEnglish
Pages (from-to)7837-7841
Number of pages5
JournalAntimicrobial Agents and Chemotherapy
Issue number12
Publication statusPublished - 1 Dec 2015
Externally publishedYes

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