Fig. 3

Relative fitness of Staphylococcus aureus ATCC 15564 (SA^WT), oxacillin-induced S. aureus (SA^OXA), ciprofloxacin-induced S. aureus (SA^CIP), and clinically isolated multidrug-resistant S. aureus CCARM 3080 (SA^MDR) after 24-h exposure to twofold MIC of ciprofloxacin at 37 °C compared to the respective untreated control. Different letters (a–d) on the bars indicate significant difference among strains at p < 0.05