title: Antimicrobial activity of Ro 24-6778, a covalent bonding of desmethylfleroxacin and desacetylcefotaxime.
abstract: A new "dual action" cephalosporin (Ro 24-6778), representing an ester-linked desacetylcefotaxime and desmethylfleroxacin was tested against 287 aerobic bacteria. Ro 24-6778 was found to be very active (minimal inhibitory concentrations [MIC90], less than or equal to 0.5 micrograms/ml) against Enterobacteriaceae, Streptococcus spp., and Aeromonas hydrophila. Moderate Ro 24-6778 activity (MIC90, 1-8 micrograms/ml) was demonstrated against Bacillus spp., Staphylococcus spp. (including oxacillin-resistant strains), Flavobacterium spp., Enterococcus durans, and Acinetobacter anitratus. More Ro 24-6778-resistant strains (MIC90, 16- greater than 32 micrograms/ml) were usually found among the enterococci, Xanthomonas hydrophila, Pseudomonas spp., and Achromobacter xyloxidans isolates. These preliminary Ro 24-6778 MIC test results show a spectrum superior (93.4% of strains susceptible at less than or equal to 8 micrograms/ml) to the comparison drugs (cefotaxime or fleroxacin) and possible clinical utility for therapy of many fluoroquinolone- or cephalosporin-resistant strains.
authors.affiliation: Clinical Microbiology Institute, Inc., Tualatin, Oregon.
authors.forename: R N
authors.initials: RN
authors.lastname: Jones
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001420:Bacteria, Aerobic / Q000187:drug effects*; D002439:Cefotaxime / Q000031:analogs & derivatives* / Q000494:pharmacology; D002939:Ciprofloxacin / Q000031:analogs & derivatives* / Q000494:pharmacology; D004338:Drug Combinations; D016576:Fleroxacin; D006801:Humans; D008826:Microbial Sensitivity Tests
chemical_list: D000900:Anti-Bacterial Agents; D004338:Drug Combinations; C065387:Ro 24-6778; D002939:Ciprofloxacin; C029281:desacetylcefotaxime; D002439:Cefotaxime; D016576:Fleroxacin