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Amoxicillin-clavulanic acid was compared with ampicillin-sulbactam in preventing the development of mixed infections produced in mice by subcutaneous inoculation of amoxicillin-resistant strains of Bacteroides fragilis and Escherichia coli. At doses designed to produce concentrations in mouse plasma similar to those obtained in humans, both amoxicillin-clavulanic acid and ampicillin-sulbactam were effective in preventing an infection caused by B. fragilis VPI 8908 mixed with E. coli E96, both strains being susceptible in vitro to each combination. However, ampicillin-sulbactam failed to arrest the progression of infections involving a more potent beta-lactamase-producing strain, E. coli 41548, even when a comparatively low inoculum was tested. In contrast, amoxicillin-clavulanic acid therapy effectively reduced the bacterial numbers at the site of infection. These data illustrate the need to treat polymicrobial infections with agents effective against the responsible aerobic as well as anaerobic bacteria.

antimicrobial agents and chemotherapy

Comparative efficacies of amoxicillin-clavulanic acid and ampicillin-sulbactam against experimental Bacteroides fragilis-Escherichia coli mixed infections