title: Resistance patterns of nonfermentative gram-negative rods and aeromonads to beta-lactam antibiotics: a diagnostic aid.
abstract: Consistent resistance to certain antimicrobial agents has in the past been of help in the diagnosis of nonfermentative gram-negative rods. In order to establish patterns of consistent resistance to 15 mostly newer betalactam antibiotics, 561 strains of such organisms plus Aeromonas and Plesiomonas were tested with the Kirby-Bauer method and also against the selective agent C-390 in three concentrations in Mueller-Hinton agar. No species-specific patterns emerged but the resistance data can be used to exclude certain species. C-390 was almost specifically selective for Pseudomonas aeruginosa.
mesh_terms: D000166:Acridines / Q000494:pharmacology; D000333:Aeromonas / Q000187:drug effects; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004352:Drug Resistance, Microbial; D006090:Gram-Negative Bacteria / Q000187:drug effects*; D008826:Microbial Sensitivity Tests / Q000379:methods; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D013045:Species Specificity; D047090:beta-Lactams
chemical_list: D000166:Acridines; D000900:Anti-Bacterial Agents; D047090:beta-Lactams; C030016:9-chloro-9-(4-diethylaminophenyl)-10-phenylacridan