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Resistance to linezolid (LZD) occurs through mutations in 23S rRNA and ribosomal proteins L3 and L4 or through methylation of 23S rRNA by Cfr. Here we report novel L3 mutations, ΔSer145/His146Tyr and ΔMet169-Gly174, co-occurring with cfr in LZD-resistant Staphylococcus aureus isolates recovered from a hospital outbreak in Madrid, Spain. LZD MIC values (16, 32, or 64 μg/ml) correlated with the presence and severity of the L3 mutation. All isolates had TR-700 (torezolid) MIC values of ≤ 2 μg/ml.

antimicrobial agents and chemotherapy

Elevated Linezolid Resistance in Clinical <i>cfr</i> -Positive <i>Staphylococcus aureus</i> Isolates Is Associated with Co-Occurring Mutations in Ribosomal Protein L3

Elevated Linezolid Resistance in Clinical cfr -Positive Staphylococcus aureus Isolates Is Associated with Co-Occurring Mutations in Ribosomal Protein L3