FIG. 3.

ROC curve based on specificity and sensitivity rates of the disk diffusion test on MSA (oxacillin, 1 μg) for S. aureus isolates relative to MICs (oxacillin susceptible = MIC of ≤2 μg/ml; oxacillin resistant = MIC of ≥4 μg/ml); two isolates with MICs of 3 μg/ml were excluded from this analysis.