Fig. 1

Survivors of Staphylococcus aureus ATCC 15564 (SA^WT; circle), oxacillin-induced S. aureus (SA^OXA; triangle), ciprofloxacin-induced S. aureus (SA^CIP; square), and clinically isolated multidrug-resistant S. aureus CCARM 3080 (SA^MDR; diamond) treated with increasing minimum inhibitory concentrations (MICs) of ciprofloxacin at 37 °C. The MICs of ciprofloxacin against SA^WT, SA^OXA, SA^CIP, and SA^MDR were 2, 1, 32, and 32 μg/ml, respectively. The dotted line indicates inoculum levels