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Number of resistant antibiotic classes as a predictor of USA300 MRSA. The numbers above the curve refer to the number of antibiotic classes to which the isolates expressed resistance. A cutoff point of resistance to ≤2 classes for USA300 and to ≥3 classes for USA100 isolates is seen (AUC 0.84, 95% CI 0.78 to 0.90). The cutoff point was calculated using the Youden index (48).
