[Investigation of the antibacterial activity of faropenem against Streptococcus pneumoniae].
We evaluated the antibacterial activity of faropenem against penicillin-susceptible Streptococcus pneumoniae (PSSP) and penicillin-resistant S. pneumoniae (PRSP). It was shown that the minimum inhibitory concentrations against 90% of the clinically isolated strains (MIC90) of faropenem, penicillin G, cefaclor, cefcapene, and cefditoren against PSSP were 0.032, 0.063, 2, 0.25, and 0.125 micrograms/ml, respectively. While those against PRSP were 0.5, 2, > 128, 1, and 1 micrograms/ml, respectively. Furthermore, we evaluated the bactericidal activity, at the level of 1/4, 1, and 4 MIC, of faropenem and the above four reference antibacterial agents against PSSP and PRSP. Against PSSP No. 127, a sensitive strain to both penicillin G and cefcapene, faropenem showed almost the same bactericidal activity as those of reference agents. Against PSSP No. 108, a penicillin-susceptible and cephem-resistant strain, and PRSP No. 57, a resistant strain to both of penicillin and cephem, faropenem of 1 MIC showed bactericidal activity, but reference agents needed 4 MIC to show bactericidal activity.
Hanaki
H
H
Dept. Bacteriology, Juntendo-Univ., Tokyo, Japan.
Inaba
Y
Y
Hiramatsu
K
K
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002433:Cefaclor / Q000494:pharmacology; D002511:Cephalosporins / Q000494:pharmacology; D004352:Drug Resistance, Microbial; D007769:Lactams; D010400:Penicillin G / Q000494:pharmacology; D010403:Penicillin Resistance; D013296:Streptococcus pneumoniae / Q000187:drug effects*; D047090:beta-Lactams
D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D007769:Lactams; D047090:beta-Lactams; D002433:Cefaclor; C073460:cefditoren; C107057:fropenem; D010400:Penicillin G