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Appl. Environ. Microbiol., 09 1997, 3394-3398, Vol 63, No. 9
K Kimura, AL McCartney, MA McConnell and GW Tannock
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.
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
Department of Microbiology, University of Otago, Dunedin, New Zealand.
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