title: In vivo activity of HSR-903, a new fluoroquinolone, against respiratory pathogens.
abstract: The in vivo activity of HSR-903, a new fluoroquinolone, against major bacteria which cause respiratory tract infections was evaluated. HSR-903 was active against experimental respiratory tract infections in mice challenged with penicillin-susceptible and penicillin-resistant Streptococcus pneumoniae and Haemophilus influenzae strains. Treatment with HSR-903 reduced the bacterial numbers in infected murine lungs. In accord with the pulmonary clearance results, the rates of survival for mice treated with HSR-903, sparfloxacin, levofloxacin, ciprofloxacin, and benzylpenicillin were 50, 30, 10, 0, and 0%, respectively, 14 days after being infected with penicillin-resistant S. pneumoniae. A pharmacokinetic study with pneumonic mice showed that the levels of HSR-903 in the lungs were seven to eight times higher than those in the plasma. These results indicate that clinical studies of HSR-903 against respiratory tract infections may be warranted.
authors.affiliation: Department of Microbiology, Toho University School of Medicine, Tokyo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yoshizumi
authors.forename: H
authors.initials: H
authors.lastname: Domon
authors.forename: S
authors.initials: S
authors.lastname: Miyazaki
authors.forename: K
authors.initials: K
authors.lastname: Yamaguchi
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000493:pharmacokinetics / Q000627:therapeutic use*; D019540:Area Under Curve; D024841:Fluoroquinolones; D006192:Haemophilus Infections / Q000188:drug therapy* / Q000382:microbiology; D006193:Haemophilus influenzae; D064704:Levofloxacin; D051379:Mice; D008813:Mice, Inbred ICR; D008826:Microbial Sensitivity Tests; D015242:Ofloxacin / Q000493:pharmacokinetics / Q000627:therapeutic use; D015363:Quinolones / Q000493:pharmacokinetics / Q000627:therapeutic use*; D012141:Respiratory Tract Infections / Q000188:drug therapy* / Q000382:microbiology; D013290:Streptococcal Infections / Q000188:drug therapy* / Q000382:microbiology; D013296:Streptococcus pneumoniae
chemical_list: D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D015363:Quinolones; D064704:Levofloxacin; D015242:Ofloxacin; C106426:olamufloxacin; C061363:sparfloxacin