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In Vitro Activity of Josamycin and Rosamicin Against Bacteroides fragilis Compared with Clindamycin, Erythromycin, and Metronidazole

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Abstract

The inhibitory and bactericidal activities of josamycin and rosamicin against 29 clinical isolates of Bacteroides fragilis were compared with those of clindamycin, erythromycin, and metronidazole by a broth dilution technique. Josamycin and rosamicin had similar inhibitory activity to metronidazole and clindamycin. Rosamicin had similar bactericidal activity to clindamycin but was less bactericidal than metronidazole (the most bactericidal agent tested). Josamycin was slightly more bactericidal than erythromycin (the least bactericidal agent tested), but less so than rosamicin and clindamycin.

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