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The therapeutic efficacy of ciprofloxacin, an investigational quinoline derivative, was compared with those of ticarcillin and tobramycin in guinea pigs with experimental Pseudomonas aeruginosa pneumonia. Guinea pigs challenged with tracheal instillations of 10(8) CFU of P. aeruginosa developed acute pneumonia, for which survival rates were: controls, 0%; ticarcillin treatment, 37%; ciprofloxacin treatment, 57%; and tobramycin treatment, 69%. Intrapulmonary killing of P. aeruginosa was greater (P less than 0.05) in animals treated with ciprofloxacin or tobramycin than in groups treated with ticarcillin. A more chronic, nonfatal form of bronchopneumonia caused by P. aeruginosa was induced with agar beads impregnated with bacteria for pulmonary challenge. In this model, ciprofloxacin treatment resulted in significantly (P less than 0.001) greater intrapulmonary killing than did any other therapy. These data suggest that ciprofloxacin may be useful in the treatment of acute and more-chronic forms of pulmonary infection caused by P. aeruginosa.

Comparative activities of ciprofloxacin, ticarcillin, and tobramycin against experimental Pseudomonas aeruginosa pneumonia