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Viable counts of the quinolone-susceptible E. coli CFT073-RR and the three isogenic derivative strains (E. coli CFT073-RR/p449, E. coli CFT073-RR GyrAr, and CFT073-RR GyrAr/p449) in in vitro time-kill assays with ciprofloxacin at the fixed concentration of 0.5 μg/ml.
