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  • Title: In vitro activity of ciprofloxacin (Bay o 9867).
    Author: Fass RJ.
    Journal: Antimicrob Agents Chemother; 1983 Oct; 24(4):568-74. PubMed ID: 6228192.
    Abstract:
    The in vitro activities of ciprofloxacin (Bay o 9867) and seven comparative antimicrobial agents against 664 aerobic and facultatively anaerobic bacterial isolates were studied. Minimal inhibitory concentrations (MICs) of ciprofloxacin were less than or equal to 2 micrograms/ml for Enterobacteriaceae, less than or equal to 8 micrograms/ml for nonfermentative gram-negative bacilli, less than or equal to 4 micrograms/ml for gram-positive cocci, less than or equal to 0.03 micrograms/ml for Aeromonas hydrophila and Pasteurella multocida, and less than or equal to 1 microgram/ml for Listeria monocytogenes. MICs for multi-drug-resistant Enterobacteriaceae and Pseudomonas aeruginosa were less than or equal to 4 micrograms/ml. Ciprofloxacin MICs were consistently 0 to 4 (usually 2 to 3) dilution steps lower than those of a related drug, norfloxacin (P less than 0.0001). For most species, they were lower than MICs of cefotaxime, aztreonam, theinamycin, mezlocillin, trimethoprim-sulfamethoxazole, and amikacin. With all eight drugs, increasing the inoculum size by 100-fold had a variable effect on MICs which was species related. Ciprofloxacin is a potent broad-spectrum new antimicrobial agent.
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