A comparison of the bactericidal activity of quinolone antibiotics in a Mycobacterium fortuitum model

Stephen H. Gillespie, Ian Morrissey, Dean Everett

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

New agents are urgently needed to meet the threat of multiple drug-resistant tuberculosis and to manage infection with the naturally resistant non-tuberculosis mycobacteria. Earlier finoroqninolones have been shown to have promising in-vitro activity, although mouse infection and clinical studies suggested that they lack sufficient bactericidal activity. Methods were evaluated to measure the bactericidal activity of fluoroqinolones and to compare the new agent moxifloxacin with other fouroquinolones with M. fortuitum as a model system. The optimum bactericidal concentrations (OBC) for the fouroquinolones were: Moxifioxacin, 0.5 mg/L; ciprofioxacin and sparfloxacin, 2mg/L and ofloxacin, 8mg/L. The bactericidal indices (BI) for moxifloxacin, ciprofloxacin, sparfloxacin and ofloxacin were 1.8, 0.5, 0.2 and 0.2, respectively. Similar ranking was obtained when the time taken to produce one log10 reduction in viable count was calculated. These data indicate that moxifloxacin was the most bactericidal of the flouroquinolones tested. Such methods provide a simple in-vitro measure that correlates with in-vivo models.

Original languageBritish English
Pages (from-to)565-570
Number of pages6
JournalJournal of Medical Microbiology
Volume50
Issue number6
DOIs
StatePublished - 2001

Fingerprint

Dive into the research topics of 'A comparison of the bactericidal activity of quinolone antibiotics in a Mycobacterium fortuitum model'. Together they form a unique fingerprint.

Cite this