Gel electrophoresis results for S. aureus isolates screened using our diagnostic assay. The ladder is composed of 100-bp increments. Lanes 1 to 15, clinical S. aureus isolates. PC, positive control. There are 3 PCs, one for mecC (163 bp), one for mecA (310 bp), and one for PVL (433 bp). All 3 controls are also positive for femB (651 bp).