title: In-vitro microbiological activities of DuP 105 and DuP 721, novel synthetic oxazolidinones.
abstract: DuP 105 and 721, synthetic antibiotics belonging to a totally novel chemical class (oxazolidinones), have been found to be active in vitro against a wide range of Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus. DuP 721 had geometric mean MICs ranging from 1.1 to 16 mg/l against 167 strains of Staph. aureus, Staph. epidermidis, Staph. saprophyticus, streptococci of Groups A, B and D and diphtheroids. DuP 105 was between 1.5 and eight-fold less active. Bacteroides fragilis strains were also susceptible to the DuP compounds (mean MICs being 8.3 and 14.9 mg/l for DuP 721 and 105, respectively), but other Gram-negative species and yeasts were not inhibited by concentrations in excess of 100 mg/l. Both compounds had a predominantly bacteriostatic action. No primary resistance was found, and the incidence of resistant variants in 105 strains tested was less than 1 per 10(8) bacteria.
mesh_terms: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000254:growth & development; D002176:Candida albicans / Q000187:drug effects; D004352:Drug Resistance, Microbial; D004755:Enterobacteriaceae / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects*; D006801:Humans; D008826:Microbial Sensitivity Tests; D010080:Oxazoles / Q000494:pharmacology*; D023303:Oxazolidinones; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D013210:Staphylococcus / Q000187:drug effects / Q000254:growth & development; D013997:Time Factors
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D010080:Oxazoles; D023303:Oxazolidinones; C054755:4-acetylphenyloxooxazolidinylmethylacetamide; C054753:4-methylsulfinylphenyloxooxazolidinylmethylacetamide