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The ability of seven S. aureus stains to form colonies at a concentration of 1/2 MIC (64 μg/mL, except 8 μg/mL for S. aureus BA01511) bacitracin was assayed after pre-exposure to colistin for 90 min. (A) S. aureus BA01611 isolate was also incubated on MHA without bacitracin, (B) S. aureus BA01511, (C) S. aureus WS1, (D) S. aureus RN4220, (E) S. aureus Mu50, (F) S. aureus ATCC 29213, and (G) S. aureus Newman.
