In vitro activity of BAY 12-8039, a new fluoroquinolone, against species representative of respiratory tract pathogens.


Journal Article

The in vitro antibacterial activity of BAY 12-8039, a novel 8-methoxy-quinolone, was compared with those of other quinolones, amoxicillin/clavulanate, cefuroxime and erythromycin against species commonly implicated in respiratory tract infections as well as viridans group streptococci. The new compound was highly active against methicillin-susceptible staphylococci (MIC90 0.125 microgram/ml), penicillin-susceptible and penicillin-resistant pneumococci (MIC90 0.5 and MIC50 0.25 microgram/ml, respectively), penicillin-susceptible and penicillin-resistant viridans group streptococci (MIC90 0.5 and 0.25 microgram/ml, respectively), group A streptococci (MIC90 0.25 microgram/ml), M. catarrhalis (MIC90 0.125 microgram/ml) and H. influenzae (MIC90 0.063 microgram/ml), irrespective of beta-lactamase production. It was, however, less active against methicillin-resistant staphylococci (MIC50 and MIC90, 2 and 4 micrograms/ml, respectively). The new compound demonstrated bactericidal activity at concentrations 2, 4, 8 times the MIC against representative isolates of the above collection. At a concentration of eight times the MIC, the frequency of spontaneous resistance ranged from 2.5 x 10(-7) to < 4 x 10(-8). These results suggested that BAY 12-8039 would be a promising agent for the eradication of respiratory tract pathogens and that clinical trials assessing its efficacy for the management of infections caused by these organisms are warranted.

Full Text

Cited Authors

  • Souli, M; Wennersten, CB; Eliopoulos, GM

Published Date

  • April 1998

Published In

Volume / Issue

  • 10 / 1

Start / End Page

  • 23 - 30

PubMed ID

  • 9624540

Pubmed Central ID

  • 9624540

Electronic International Standard Serial Number (EISSN)

  • 1872-7913

International Standard Serial Number (ISSN)

  • 0924-8579

Digital Object Identifier (DOI)

  • 10.1016/s0924-8579(98)00020-x


  • eng