Effect of a Mixture of Lactobacillus casei and Lactobacillus acidophilus Administered Orally on the Immune System in Mice

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Abstract
The effects of an orally-administered mixture of Lactobacillus casei and Lactobacillus acidophilus on the immune system in Swiss albino mice were studied. Non-fermented milk containing viable cultures of both microorganisms was fed for different consecutive days to the animals, the effect of such feeding on their immune system was evinced by macrophage and lymphocyte activation. An increase both in the in vitro phagocytic activity of peritoneal macrophages and in the carbon clearance activity was observed. As regard the lymphocytic activity, the mixture produced a higher activation than that in the control mice. The enhanced macrophage and lymphocytic activity by administering cultures via the oral route, suggest the advisability of using the mixture of bacteria for a more efficient stimulation of the host immune response.