Bacteroides fragilis is normal colonic flora, but under what conditions does it cause disease?
Answer: Bacteroides fragilis has very low virulence; however, intestinal perforation may lead to secondary peritonitis and abscess formation. Bacteroides fragilis may also be pathogenic in situations of gyn pathology (pelvic inflammatory disease [PID], septic abortion).
Note that 1° peritonitis = spontaneous bacterial peritonitis, 2° = peritonitis due to perforation/necrosis
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