[Susceptibility testing of clinical strains of Legionella spp. isolated in Japan].

We determined antimicrobial susceptibilities of 23 strains of Legionella spp. clinically isolated in Japan, between September 1994 through November 1999 by using Etest. The MICs of all isolates against macrorides, fluoroquinolones and rifampicin showed 1 microgram/ml or less. Especially rifampicin showed the most potent activity, of which the MICs of all isolates showed 0.064 microgram/ml or less. Although we could not find resistant strains against any antibiotics tested in this study, we think it is important to follow up the susceptibilities of clinical isolates of Legionella.