title: In-vitro activity of BRL-36650, a novel beta-lactamase-stable penicillin, against multiply resistant gram-negative organisms.
abstract: The in-vitro activity of BRL-36650, a novel beta-lactamase-stable penicillin was tested in comparison with that of cefotaxime, ceftazidime, aztreonam and imipenem against 559 multiply resistant Gram-negative organisms, some of which were also resistant to third generation cephalosporins. BRL-36650 and imipenem were the most active antibiotics. Against 342 Enterobacteriaceae the MICs90 were: imipenem 2 mg/l, BRL-36650 4 mg/l, aztreonam 8 mg/l and cefotaxime 32 mg/l. Against 122 Pseudomonas aeruginosa the MICs90 were: BRL-36650 4 mg/l, imipenem 8 mg/l, aztreonam and ceftazidime 64 mg/l.
mesh_terms: D000617:Aminoglycosides / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D003470:Culture Media; D004755:Enterobacteriaceae / Q000187:drug effects; D006090:Gram-Negative Bacteria / Q000187:drug effects*; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance; D010406:Penicillins / Q000494:pharmacology*; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D047090:beta-Lactams
chemical_list: D000617:Aminoglycosides; D000900:Anti-Bacterial Agents; D003470:Culture Media; D010406:Penicillins; D047090:beta-Lactams; C043286:foramidocillin