Pathogenicity of piliated and encapsulated Bacteroides fragilis

Eur J Clin Microbiol. 1984 Jun;3(3):207-9. doi: 10.1007/BF02014880.


Of 20 isolates of the Bacteroides fragilis group, only three were encapsulated (C+) and these induced abscesses in mice. After coinoculation with live, formalized or capsular material from other bacteria seven other isolates formed abscesses. The Bacteroides recovered from these abscesses were C+; those that had been inoculated with Klebsiella had pili-like and bacteriophage-like structures. Once encapsulated, the Bacteroides isolates induced abscesses when injected alone.

Publication types

  • Comparative Study

MeSH terms

  • Abscess / microbiology
  • Animals
  • Bacteroides / pathogenicity
  • Bacteroides / ultrastructure
  • Bacteroides Infections / complications
  • Bacteroides Infections / microbiology
  • Bacteroides fragilis / pathogenicity*
  • Bacteroides fragilis / ultrastructure
  • Fimbriae, Bacterial / physiology*
  • Fimbriae, Bacterial / ultrastructure
  • Klebsiella Infections / complications
  • Klebsiella Infections / microbiology
  • Klebsiella pneumoniae / pathogenicity
  • Mice