. production of intestinal mucines, their trophic effect on intestinal epithelium, the re-establishment of the intestinal mucosa integrity, the stimulation of the IgA-mediated immune response against. lymphoid cells, single lymphocytes scattered in the lamina propria and intraepithelial lymphocytes spread in the intestinal epithelia. The immune system of infants is not fully developed. The structures. predisposing factors. Nonetheless, clinical trials with products containing both lactobacilli and bifidobacteria have demonstrated the safety of these probiotics in infants and children, and in a...