2003•Antimicrobial Agents and ChemotherapyOpen access

Activity of AZD2563, a Novel Oxazolidinone, against Staphylococcus aureus Strains with Reduced Susceptibility to Vancomycin or Linezolid

Robin A. Howe, Mandy Wootton, Alan R. Noel, Karen E. Bowker, Timothy Rutland Walsh, Alasdair P. MacGowan

Abstract

The susceptibilities of clinical vancomycin-intermediate Staphylococcus aureus (VISA), heterogeneous VISA, and laboratory-generated linezolid-resistant S. aureus strains to the new oxazolidinone AZD2563 were assessed by agar dilution MIC determination. All clinical strains were susceptible to linezolid, and the linezolid MICs for them were equal to or twofold higher than those of AZD2563. Cross-resistance with linezolid was seen in laboratory-generated mutants, and for these strains the MIC of AZD2563 was twofold higher than that of linezolid.

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Key concepts: Linezolid, Staphylococcus aureus, Microbiology, Vancomycin, Agar dilution, Agar Dilution Method, Antibiotics, Minimum inhibitory concentration