title: In vitro activity of the oxazolidinone RWJ-416457 against linezolid-resistant and -susceptible staphylococci and enterococci.
abstract: RWJ-416457, a novel oxazolidinone, had modal MICs of 0.5 to 1 microg/ml for linezolid-susceptible staphylococci and enterococci, versus linezolid MICs for these organisms of 1 or 2 microg/ml. RWJ-416457 MICs for mutants with 23S rRNA mutations were 2 to 32 microg/ml, versus linezolid MICs of 8 to 64 microg/ml; actual values reflected the proportion of gene copies mutated.
authors.affiliation: Antibiotic Resistance Monitoring and Reference Laboratory, Health Protection Agency Centre for Infections, 61 Colindale Avenue, London NW9 5EQ, United Kingdom. david.livermore@hpa.org.uk
authors.forename: David M
authors.initials: DM
authors.lastname: Livermore
authors.forename: Marina
authors.initials: M
authors.lastname: Warner
authors.forename: Shazad
authors.initials: S
authors.lastname: Mushtaq
authors.forename: Sarah
authors.initials: S
authors.lastname: North
authors.forename: Neil
authors.initials: N
authors.lastname: Woodford
mesh_terms: D000081:Acetamides / Q000494:pharmacology*; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D024881:Drug Resistance, Bacterial; D013293:Enterococcus faecalis / Q000187:drug effects* / Q000235:genetics; D016984:Enterococcus faecium / Q000187:drug effects* / Q000235:genetics; D000069349:Linezolid; D016106:Methicillin Resistance; D008826:Microbial Sensitivity Tests; D009154:Mutation / Q000235:genetics / Q000502:physiology; D023303:Oxazolidinones / Q000494:pharmacology*; D012150:Polymorphism, Restriction Fragment Length; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013211:Staphylococcus aureus / Q000187:drug effects* / Q000235:genetics
chemical_list: D000081:Acetamides; D000900:Anti-Bacterial Agents; D023303:Oxazolidinones; C518323:RWJ-416457; D000069349:Linezolid