References
- Walker RI. Intestinal barriers to bacteria and their toxins. Annual Rev Med 1990; 41: 393–400
- Mitsuoka T. Recent trends in research on intestinal flora. Bifidobacteria Microflora 1982; 1: 3–24
- Luini W, Sozzani S, Braceschi L, Vecchi A, Spreafico F. Effect of bacterial purified antigenic fractions on natural defence mechanisms. Immunopharmacology 1989; 18: 73–79
- Mitsuoka T. Taxonomy and ecology of Bifidobacteria. Bifidobacteria Microflora 1984; 1: 51–54
- Rasic J. The role of dairy foods containing Bifido- and acidophilus bacteria in nutrition and health. North Eur Dairy J 1983; 49: 80–88
- Makidonan T, Kay M. Age influence on the immune system. Adv Immunol 1980; 29: 287–330
- Kawanishi H, Kiely J. Immune-related alterations in aged gut-associated lymphoid tissues in mice. Digestive Diseases Sciences 1989; 34: 175–184
- Kay M, Makidonan T. Relationship between aging and the immune system. Prog Allergy 1981; 29: 134–181
- Strober W, Richman LK, Elson CO. The regulation of gastrointestinal immune responses. Immunol Today 1981; 2: 156–162
- Abrams GD, Bauer H, Sprinz H. Influence of the normal flora on mucosal morphology and cellular renewal in the ileum. A comparison of germ-free and conventional mice. Lab Invest 1963; 12: 355–364
- Vacca A, Pantaleo G, Dammacco F. Stimulation of antibody response in the gastrointestinal mucosa of immunodeficient mice by oral treatment with bacterial antigens. An immunoperoxidase study. Int J Immunopharmac 1989; 11: 341–348
- Bienenstock J, Befus AD. Mucosal Immunology. Immunology 1980; 41: 249–270