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The in-vitro activity of AM-1155, a 6-fluoro-8-methoxy quinolone, was compared with those of temafloxacin, sparfloxacin, tosufloxacin, ciprofloxacin, ofloxacin and cefmetazole, a cephamycin, against a variety of anaerobic bacteria. Although AM-1155 demonstrated only modest activity against the Bacteroides fragilis group and Prevotella bivia (MIC90s &gt; or =3.13 mg/mL), 76% of the B. fragilis strains tested were inhibited at AM-1155 concentrations of 0.78 mg/L. AM-1155 was highly active against Prevotella intermedia, Porphyromonas gingivalis, Fusobacterium spp., Clostridium perfringens and Mobiluncus spp. (MIC90s &lt; or =0.39 mg/L). An in-vivo study using a mixed infection with AM-1155- and tosufloxacin-susceptible B. fragilis and Escherichia coli strains in rat granuloma pouch was performed. AM-1155 was effective against both organisms whereas tosufloxacin was effective only against E. coli. These results correlated well to the higher pouch levels of AM-1155 than those of tosufloxacin. Clostridium difficile overgrowth was found in the caecum of mice treated with ampicillin both 1 and 7 days after 5 days dosing, but not in AM-1155-treated mice. These results suggest that the clinical efficacy of AM-1155 against infections involving most anaerobic bacteria except for the B. fragilis group and P. bivia should be evaluated further.

Comparative in-vitro and in-vivo activity of AM-1155 against anaerobic bacteria