In vitro antibacterial activities of S-013420, a novel bicyclolide, against respiratory tract pathogens.
OBJECTIVE
The in vitro activity of S-013420, a novel bicyclolide, was investigated.


METHODS
All test strains for this study were isolated from Japanese medical facilities. MICs were determined by the microbroth dilution method or agar dilution method according to the CLSI guidelines. In time-kill kinetics, viable cells were measured at 1, 2.5, 4 and 6 h after exposure to antimicrobials. The frequencies of single-step resistance acquisition at 4x MIC and 8x MIC were determined using 10(7) cfu of bacterial cells.


RESULTS
S-013420 showed MIC(90) values of 0.125, 0.125, 8 and 0.5 mg/L for Streptococcus pneumoniae, Streptococcus pyogenes, Haemophilus influenzae and Moraxella catarrhalis, respectively. S-013420 showed the most potent activity against erythromycin-intermediate and -resistant S. pneumoniae with an MIC(90) of 0.25 mg/L and inhibited the growth of all strains of S. pyogenes with macrolide resistance genes at 1 mg/L. The MICs of S-013420 for atypical pathogens such as erythromycin-susceptible Mycoplasma pneumoniae and Chlamydophila pneumoniae were 0.00049-0.001 and 0.0039 mg/L, respectively, although the activity of S-013420, as well as other macrolide agents, against erythromycin-resistant M. pneumoniae was significantly weak. S-013420 caused a 3 log(10) reduction in viable cells against all test strains of S. pneumoniae and H. influenzae. Acquisition of resistance to S-013420 was not observed for three strains of S. pneumoniae.


CONCLUSIONS
S-013420 shows potent in vitro activity against respiratory tract pathogens. Against streptococci, including erythromycin-resistant strains, S-013420 demonstrated the most potent in vitro activity among the antimicrobials tested.
Homma
Tomoyuki
T
Discovery Research Laboratories, Shionogi & Co., Ltd, Toyonaka, Osaka 561-0825, Japan. tomoyuki.honma@shionogi.co.jp
Fujimura
Takaji
T
Maki
Hideki
H
Yamano
Yoshinori
Y
Shimada
Jingoro
J
Kuwahara
Shogo
S
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000302:isolation & purification; D024881:Drug Resistance, Bacterial; D006801:Humans; D007564:Japan; D008826:Microbial Sensitivity Tests; D050296:Microbial Viability / Q000187:drug effects; D009154:Mutation; D012141:Respiratory Tract Infections / Q000382:microbiology*; D013997:Time Factors
D000900:Anti-Bacterial Agents