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The Journal of Medical Microbiology, Vol 29, Issue 3 171-176, Copyright © 1989 by Society for General Microbiology

JOURNAL ARTICLE

Epidemiology of the Bacteroides fragilis group in the colonic flora in 10 patients with colonic cancer

F. Namavar, E. B. Theunissen, A. M. Verweij-Van Vught, P. G. Peerbooms, M. Bal, H. F. Hoitsma and D. M. MacLaren
Department of Medical Microbiology, Vrije Universiteit, Faculty of Medicine, Amsterdam, The Netherlands.

We report the relative frequencies of members of the Bacteroides fragilis group in the faeces, in colon lavage fluid obtained pre-operatively, and in colonic tissue specimens obtained at operation from 10 patients with colonic cancer. B. vulgatus was the most and B. fragilis and B. ovatus were the least frequently isolated Bacteroides spp. in the faeces of the 10 subjects. B. uniformis and B. thetaiotaomicron ranked second and third in the faeces. The relative frequencies of all species except B. fragilis were lower in the lavage fluid and in cultures of mucosa. The relative frequency of B. fragilis increased from 4% in faeces to 39% in the final lavage fluid and to 42% in the colonic mucosa culture. Our results suggest that B. fragilis has a more intimate association with the gut mucosa than other members of the B. fragilis group, which might be one explanation for the high incidence of this species in gut-associated intra-abdominal infections.


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