Immunochemical and biological studies of antigens isolated from a strain of Bacteroides fragilis.
Phenol/water-extracted lipopolysaccharide and a fraction of HM, extracted with acetate buffer pH 2.0, from Bacteroides fragilis strain 62/73 are antigenically different as shown by immunodiffusion, passive haemagglutination, haemagglutination inhibition and preliminary chemical investigations. Biological activity, assessed with the local Shwartzmann reaction, was demonstrated for the lipopolysaccharide whereas antigen HM was almost inactive in this test. HM is immunogenic in rabbits. Antibodies against HM were detected in seven out of ten sera of healthy humans.
D000818:Animals; D000942:Antigens, Bacterial / Q000032:analysis / Q000276:immunology*; D001441:Bacteroides fragilis / Q000276:immunology*; D006384:Hemagglutination; D006801:Humans; D008070:Lipopolysaccharides / Q000276:immunology; D011817:Rabbits
D000942:Antigens, Bacterial; D008070:Lipopolysaccharides