[In vitro chemo-antibiotic sensitivity of gram-negative bacteria from various biological materials. Comparison between aztreonam and other agents].

527 Gram negative bacterial strains isolated from different biological substances were studied by chemo-antibiotic sensitivity. The examination was carried out by the agar diffusion test (Kirby-Bauer). A very good sensitivity to aztreonam (E. coli, Serratia spp., Klebsiella spp., Proteus spp.), to amikacin (Pseudomonas spp., Enterobacter spp., Citrobacter spp.) and to norfloxacin (Citrobacter spp.) was found. Even when it was not the best, aztreonam was the second (Citrobacter spp.) or the third choice (Pseudomonas spp.), always near to the drug of first choice.