Figure 1From: In vitro selection of resistance in Escherichia coli and Klebsiella spp. at in vivo fluoroquinolone concentrationsMulti-step selection of resistance in E. coli (A) and Klebsiella spp. (B) at plasma concentration of fluoroquinolones. 1, 5, 10 step: number of passages on antibiotic gradient agar plates. 10 step free: passages on antibiotic free agar plates. Black bars: prulifloxacin; White bars: ciprofloxacin; Dotted bars: levofloxacin.Back to article page