title: In vitro antibacterial activity and beta-lactamase stability of CL 118523, an aminothiazolyl iminomethoxy cephalosporin.
abstract: CL 118523 is an aminothiazolyl cephalosporin which contains a 1, 2, 3-thiadiazol radical at position 3 of the cephem nucleus. It was as active as cefotaxime, ceftazidime and aztreonam against most Enterobacteriaceae, MIC 90% less than 1 mg/l, and more active, 8 to 32-fold, than cefoperazone and cefoxitin. Enterobacter species resistant to the other agents were resistant to CL 118523. CL 118523 did not inhibit Pseudomonas aeruginosa, Pseudomonas maltophilia, MIC greater than 128 mg/l. It had excellent activity against hemolytic streptococci of groups A, B, C, and G, and methicillin-susceptible Staphylococcus aureus, but failed to inhibit enterococci and methicillin-resistant staphylococci. CL 118523 was minimally hydrolyzed by plasmid and chromosomally-mediated beta-lactamases, and was a poor beta-lactamase inducer.
authors.affiliation: Department of Medicine, College of Physicians & Surgeons, Columbia University, New York, New York 10032.
authors.forename: N X
authors.initials: NX
authors.lastname: Chin
authors.forename: H C
authors.initials: HC
authors.lastname: Neu
mesh_terms: D001419:Bacteria / Q000187:drug effects*; D002439:Cefotaxime / Q000494:pharmacology; D002442:Ceftazidime / Q000494:pharmacology; D015296:Ceftizoxime / Q000031:analogs & derivatives*; D002511:Cephalosporins / Q000494:pharmacology*; D004355:Drug Stability; D004755:Enterobacteriaceae / Q000187:drug effects; D004790:Enzyme Induction; D015378:Imipenem; D008712:Methicillin / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance; D013845:Thienamycins / Q000494:pharmacology; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000096:biosynthesis
chemical_list: D002511:Cephalosporins; D013845:Thienamycins; D065093:beta-Lactamase Inhibitors; C054692:CL 118523; D015378:Imipenem; D002442:Ceftazidime; D015296:Ceftizoxime; D001618:beta-Lactamases; D002439:Cefotaxime; D008712:Methicillin