title: In vitro activity of the novel cephalosporin GR69153.
abstract: The in vitro activity of GR69153 was compared to that of ceftazidime, ceftriaxone, imipenem and gentamicin against a total of 702 recent clinical isolates. MICs were determined by a standard agar dilution procedure and two inocula (10(4) and 10(8) cfu) were used throughout. GR69153 inhibited 90% of isolates of Escherichia coli, Klebsiella pneumonia and Proteus mirabilis at less than or equal to 0.25 mg/l and 90% of isolates of Pseudomonas aeruginosa at less than or equal to 1 mg/l. Citrobacter freundii (MIC90 16 mg/l), Morganella morganii (MIC90 128 mg/l) and Enterobacter spp. (MIC90 greater than 128 mg/l) were considerably more resistant to GR69153. GR69153 was four-fold more active than ceftazidime against methicillin-sensitive Staphylococcus aureus but was inactive against methicillin-resistant Staphylococcus aureus, Enterococcus faecalis and Bacteroides fragilis group.
authors.affiliation: Division of Medical Microbiology, St. Paul's Hospital, Vancouver, British Columbia, Canada.
authors.forename: A M
authors.initials: AM
authors.lastname: Clarke
authors.forename: S J
authors.initials: SJ
authors.lastname: Zemcov
mesh_terms: D001419:Bacteria / Q000187:drug effects*; D002511:Cephalosporins / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests
chemical_list: D002511:Cephalosporins; C066944:GR 69153