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The in vitro and in vivo activities of AM-1155, a new quinolone, against Chlamydia spp. were investigated. The MIC of AM-1155 for 10 standard strains of different Chlamydia spp. and 25 wild-type strains of Chlamydia pneumoniae isolated in Japan, which were morphologically different from clinical isolates from the United States, ranged from 0.063 to 0.125 microg/ml. Its activity was almost the same as those of sparfloxacin and tosufloxacin and was 4 and 16 times superior to those of levofloxacin and ciprofloxacin, respectively, but lower than those of clarithromycin and minocycline (range for each, 0.016 to 0.031 microg/ml). The minimal chlamydiacidal concentration of AM-1155 ranged from 0.063 to 0.125 microg/ml, while those of clarithromycin and minocycline ranged from 0.016 to 0.031 microg/ml and 0.016 to 0.063 microg/ml, respectively. The therapeutic effect of a 7-day course of AM-1155 at doses of 5 and 10 mg/kg of body weight administered orally twice daily to mice with experimental Chlamydia psittaci pneumonia was excellent, with a 100% survival rate at 21 days after infection. The efficacy was equal to those of clarithromycin and minocycline and higher than those of ciprofloxacin and ofloxacin.

In vitro and in vivo activities of AM-1155, a new fluoroquinolone, against Chlamydia spp