LCT and lactose intolerance: In the present study, the presence of lactulose degrading enzyme and lactase in almost all lactobacilli is of great importance not only in the intestinal tract where they may ferment lactulose and grow but also they may improve lactose intolerance via fermentation in intolerant-lactose consumers, and thus those lactobacilli could be proposed as a dietary adjunct for milk to aid lactose digestion in humans as reported by Kim and Gilliland (1983) for L. acidophilus.