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    HOFSTAD, TOR 2009. PRECIPITATING CARBOHYDRATE ANTIGENS OF BACTEROIDES FRAGILIS NCTC 9343. Acta Pathologica Microbiologica Scandinavica Section B Microbiology, Vol. 89B, Issue. 1-6, p. 215.

    Tabaqchali, S. and Wilks, M. 1992. Epidemiological aspects of infections caused byBacteroides fragilis andClostridium difficile. European Journal of Clinical Microbiology & Infectious Diseases, Vol. 11, Issue. 11, p. 1049.


    BERG, RODNEY D. 1983. Human Intestinal Microflora in Health and Disease.

    MEISEL-MIKOŁAJCZYK, FEUCJA ROKOSZ, ALICJA and GRZELAK-PUCZYŃSKA, IRENA 1981. Serological Activity of ‘Bacteroides fragilis’ Endotoxins-Strains Isolated in Poland. Journal of Applied Bacteriology, Vol. 51, Issue. 3, p. 399.

    Stringer, M. F. Turnbull, P. C. B. and Gilbert, R. J. 1980. Application of serological typing to the investigation of outbreaks of Clostridium perfringens food poisoning, 1970–1978. Journal of Hygiene, Vol. 84, Issue. 03, p. 443.

    Kasper, DennisL. Fiddian, A.Paul and Tabaqchali, Soad 1979. RAPID DIAGNOSIS OF BACTEROIDES INFECTIONS BY INDIRECT IMMUNOFLUORESCENCE ASSAY OF CLINICAL SPECIMENS. The Lancet, Vol. 313, Issue. 8110, p. 239.

    Nord, Carl Erik and Norrby, Ragnar 1979. Scandinavian Symposium on: Anaerobic Infections. Scandinavian Journal of Infectious Diseases, Vol. 11, Issue. sup19, p. 1.

    Elhag, K. M. and Tabaqchali, Soad 1978. A study of the surface and somatic antigens of Bacteroides fragilis. Journal of Hygiene, Vol. 80, Issue. 03, p. 439.

    Elhag, K. M. and Tabaqchali, Soad 1978. The distribution of Bacteroides fragilis serotypes amongst clinical strains. Journal of Hygiene, Vol. 81, Issue. 01, p. 89.


Serological studies of Bacteroides fragilis

  • K. M. Elhag (a1), K. A. Bettelheim (a1) and Soad Tabaqchali (a1)
  • DOI:
  • Published online: 01 May 2009

Using direct agglutination methods, a simple serological scheme for the classification of Bacteroides fragilis is described. Twenty strains of B. fragilis were selected by a process of successive screening from 151 strains obtained from various sources. O-antigens were prepared from the 20 strains, and used to raise antisera in rabbits.

Each of the 20 antisera reacted with its homologous antigen and eight antisera cross-reacted with other subspecies. These cross-reactions were successfully removed after absorption of the antisera with the cross-reacting antigens, resulting in 19 type-specific antisera, titres ranging from 40 to 320, and 19 distinct serotypes of B. fragilis. There was no correlation between the antigenic and the biochemical characteristics of these strains and no cross-reactions occurred with other gram-negative anaerobes, B. melaninogenicus, Sphaerophorus necrophorus and Fuso-bacterium necrogenes.

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S. L. Gorbach & J. G. Bartlett (1974). Anaerobic infections. New England Journal of Medicine 290, 1237–45.

D. L. Kasper (1976). Chemical and biological characterization of the lipopolysaccharide of Bacteroides fragilis subspecies fragilis. Journal of Infectious Diseases 134, 5966.

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A. A. B. Mitchell (1973). Incidence and isolation of Bacteroides species from clinical material and their sensitivity to antibiotics. Journal of Clinical Pathology 26, 738–41.

H. Werner (1972). A serological study of strains belonging to Sphaerophorus necrophorus, Sph. varius and Sph. freundii. Medical Microbiology and Immunology 157, 315–24.

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Epidemiology & Infection
  • ISSN: 0950-2688
  • EISSN: 1469-4409
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