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Cross-resistance among cinoxacin, ciprofloxacin, DJ-6783, enoxacin, nalidixic acid, norfloxacin, and oxolinic acid after in vitro selection of resistant populations.

Six different gram-negative bacilli were serially transferred through subinhibitory concentrations of seven quinolone derivatives or related organic acids. A gradual, stepwise decrease in susceptibility was noted with all seven drugs, and the resistant cultures demonstrated a concomitant cross-resistance to the other drugs.

Anti-Bacterial Agents↗

Susceptibility of multiply antibiotic-resistant pneumococci to the new quinoline antibiotics, nalidixic acid, coumermycin, and novobiocin.

The susceptibility of 10 multiply antibiotic-resistant strains of Streptococcus pneumoniae to several quinoline antibiotics and to coumermycin, novobiocin, and penicillin was determined. The MIC of penicillin for all test isolates was greater than or equal to 4 micrograms/ml. Ciprofloxacin was the most active quinoline derivative tested, followed by norfloxacin. These isolates of S. pneumoniae were not inhibited by the remaining quinolines at achievable concentrations in serum. Coumermycin and ciprofloxacin were the most active antibiotics tested in this study.

Aminocoumarins↗