Fig. 3
From: RpoS role in antibiotic resistance, tolerance and persistence in E. coli natural isolates
Killing curves of strains MC4100 (rpoS+) and BS1154 (rpoS-) subjected to high concentrations of ampicillin, ciprofloxacin or kanamycin. \(10^7\) exponentially growing cells diluted in medium Mueller Hinton containing 20X MIC (ampicillin and ciprofloxacin) or 10X MIC in the case of kanamycin for each strain. Samples were withdrawn at time 0 and at different time-intervals, depending on the antibiotic treatment. Each point corresponds to the mean of at least three independent experiments ± standard error of the mean. Bacterial survival was assessed by colony counting on L-agar plates