Linezolid was tested by broth microdilution against 140 clinical Nocardia i
solates belonging to seven species. The MIC at which 50% of the strains are
inhibited (MIC50) and MIG(90) for all species other than Nocardia farcinic
a were 2 and 4 mug/ml. Linezolid is the first antimicrobial agent demonstra
ted to be active against all Nocardia species.