[In vitro evaluation of antibacterial activity of the original oxime type of beta-lactam antibiotics with the 4-aminobenzensulfonamide group]. / In vitro hodnocení antibakteriální úcinnosti puvodních beta-laktamových antibiotik oximového typu se 4-aminobenzensulfonamidoskupinou.

Four newly prepared beta-lactam antibiotics of the oxime type with a 4-aminobenzensulphonamidogroup, synthetized at the Research Institute for Pharmacy and Biochemistry, Prague, were subjected to an evaluation of antibacterial efficacy in vitro. The evaluation was carried out by determining the minimal inhibitory concentration (MIC) in 47 clinical strains and 6 standard strains (Staphylococcus aureus, Streptococcus pyogenes and facecalis, E. coli, Enterobacter and Proteus spec., Pseudomonas aeruginosa). The results were compared with the MIC of cefalexin, cefoxitin, cefazolin, cefsulodin, and ampicillin. The antibacterial effect of these agents was lower than that of the compared antibiotics. It was slightly better in the pseudomonadic strains, where the efficacy of cefusulodin was best and the other four antibiotics appeared to be worst.

[In vitro antibacterial activity of new oxime type of beta-lactam antibiotics]. / Antibakteriální úcinnost nových beta-laktamových antibiotik oximového typu in vitro.

The antibacterial efficacy of two novel beta-lactam antibiotics of the oxime type, VUFB 16265 and 16272, was evaluated by determining the minimal inhibitory concentration (MIC) in 47 clinical strains and 6 standard strains (Staphylococcus aureus, Streptococcus pyogenes and faecalis, E. coli, Enterobacter and Proteus spec., Pseudomonas aeruginosa), which were the most frequent causes of infectious complications. The results were compared with the MIC of cefalexin, cefoxitin, cefazolin, cefsulodin, and ampicillin. The antibacterial activity of both VUFB drugs was comparable with the efficacy of the antibiotics tested. Only in the strains of Pseudomonas aeruginosa the activity of all antibiotics under evaluation was low and only cefsulodin was effective.

Sensitivity of Bacteroides species to modern antimicrobial preparations.

Strains of Bacteroides fragilis group isolated from peritoneal pus were tested for susceptibility to cefalotin, cefamandole, cefoxitin, clindamycin and metronidazole. Clindamycin and metronidazole were found to display the lowest MIC and MBC values. The median serum level of these antimicrobials was 2-4 times as high as the MIC effective against 100% of strains. The most active cephalosporin was the cephamycin derivative cefoxitin that inhibited 98% of strains at 16 mg/l which corresponds with the usual median serum level achieved at commonly recommended treatment regimens. The MICs of 16 mg/l to cefalotin and cefamandole were found in 9.8% and 3.7% of strains, respectively. These findings are consistent with data reported in the literature. Attention is also centered on the mode of antimicrobial action, principles of bacterial resistance and on factors which are co-responsible for the therapeutic effectiveness of the antimicrobials studied.