title: The comparative in-vitro activity of norfloxacin, ciprofloxacin, enoxacin and nalidixic acid against 423 strains of gram-negative rods and staphylococci isolated from infected hospitalised patients.
abstract: The in-vitro activities of four quinolone carboxylic acids against 423 clinical isolates of Gram-negative rods and staphylococci from infected hospitalised patients were compared. The antibiotics included nalidixic acid and the newer compounds, norfloxacin (MK-0366), ciprofloxacin (Bay 09867) and enoxacin (AT 2266 or CI919). Norfloxacin showed slightly more activity than enoxacin, but both agents had markedly greater potencies and broader antibacterial spectrums than nalidixic acid. Ciprofloxacin was the most active quinolone tested against both gentamicin-susceptible and gentamicin-resistant stains, having an MIC90 equal or less than 1 mg/l for all species studied.
mesh_terms: D000150:Acinetobacter / Q000187:drug effects / Q000276:immunology; D001419:Bacteria / Q000187:drug effects*; D001424:Bacterial Infections / Q000382:microbiology; D002939:Ciprofloxacin; D002954:Citrobacter / Q000187:drug effects / Q000276:immunology; D004352:Drug Resistance, Microbial; D015365:Enoxacin; D004755:Enterobacteriaceae / Q000187:drug effects; D004926:Escherichia coli / Q000187:drug effects; D006801:Humans; D007709:Klebsiella / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D009268:Nalidixic Acid / Q000494:pharmacology*; D009287:Naphthyridines / Q000494:pharmacology*; D009643:Norfloxacin / Q000494:pharmacology*; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D011804:Quinolines / Q000494:pharmacology*; D012705:Serratia / Q000187:drug effects / Q000276:immunology; D013210:Staphylococcus / Q000187:drug effects
chemical_list: D009287:Naphthyridines; D011804:Quinolines; D015365:Enoxacin; D009268:Nalidixic Acid; D002939:Ciprofloxacin; D009643:Norfloxacin