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Appl. Environ. Microbiol., 09 1997, 3394-3398, Vol 63, No. 9
Copyright © 1997, American Society for Microbiology

Analysis of fecal populations of bifidobacteria and lactobacilli and investigation of the immunological responses of their human hosts to the predominant strains

K Kimura, AL McCartney, MA McConnell and GW Tannock
Department of Microbiology, University of Otago, Dunedin, New Zealand.

The bifidobacterial and lactobacillus populations of fecal samples collected from 10 human subjects were studied. The numbers of bifidobacteria were similar in the fecal samples of all of the subjects, but lactobacillus numbers varied, even between samples collected from the same individual. Analysis of the composition of the bacterial populations by ribotyping and pulsed-field gel electrophoresis to differentiate between strains showed that, at least for the numerically predominant strains, each subject harbored a unique collection of bifidobacteria and lactobacilli. Predominant bifidobacterial and lactobacillus strains detected in the feces of each subject were used in immunological assays (lymphocyte transformation, serum antibody titers) to determine the influence of the bacteria on the immune system of their host. Immunoglobulin G antibodies reactive with lactobacilli were detected at high concentrations; antibodies reactive with bifidobacteria were present at lower concentrations. The antibodies appeared to be genus specific rather than strain specific. The results of the study emphasized the complexity of the relationship that exists between the intestinal microflora and the human host.

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