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The gastrointestinal tract is heavily colonized with commensal microbes with the concentration of bacteria increasing longitudinally down the length of the intestine. Bacteria are also spatially distributed transversely from the epithelial surface to the intestinal lumen with the inner mucus layer normally void of bacteria. Maintenance of this equilibrium is extremely important for human health and,...
Vertebrates are essentially born germ-free but normally acquire a complex intestinal microbiota soon after birth. Most of these organisms are non-pathogenic to immunocompetent hosts; in fact, many are beneficial, supplying vitamins for host nutrition and filling the available microbiological niche to limit access and consequent pathology when pathogens are encountered. Thus, mammalian health depends...
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