Combined activity of metronidazole and gentamicin onBacteroidesfragilis in vivo andin vitro

Abstract
A mixed aerobic/anaerobic infection in mice was established by co-injecting Bacteroides ragilis and Escherichia coli into a thigh muscle. Metronidazole administration 6 h after this inoculation resulted in a dose-dependent decrease of Bact. fragilis at 18 h after drug administration. Co-administration of gentamicin with metronidazole resulted in a significant decrease of the numbers of E. coli but did not markedly nfluence the effect of metronidazole on Bact. fragilis.

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