In vitroceftaroline combinations against meticillin-resistantStaphylococcus aureus

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We studied in vitro ceftaroline combinations against 61 meticillin-resistant Staphylococcus aureus isolates; 18 of them were also resistant to linezolid, using overlapping E-test method. Daptomycin-ceftaroline combination obtained lower fractional inhibitory concentration values, in comparison with those including vancomycin or linezolid against meticillin-resistant S. aureus (P<0.05). All meticillin- and linezolid-resistant S. aureus strains were resistant to ceftaroline; nevertheless, combinations with vancomycin or daptomycin showed higher synergy or addition rates than those with linezolid.

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