- usually will be reistant to penicillin
- try Cefoxitin or clindamycin or Flaggyl;
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Percent Susceptible Anaerobic Gram Negative Bacilli
Antimicrobial MIC B.fragilis other Bacteroides Fusobacterium
ug/ml
Flaggyl 16 100 100 100
Chloramphenicol 16 100 100 100
Imipenem 8 97 98 100
Timentin 64/2 97 96 100
Unasyn 16/8 95 93 100
clindamycin 4 96 89 98
Cefoxitin 32 90 73 100
Piperacillin 64 89 74 100
Mezlocillin 64 67 72 100
penicillin 4 20 40 100
Ampicillin 4 10 34 98
Mechanisms of microbial synergy in polymicrobial surgical infections.