Effect of lactobacilli on intestinal immunity. (A) Effect of Lactobacillus rhamnosus CRL1505 (Lr1505) or L. rhamnosus CRL1506 (Lr1506) administration on the tumor necrosis factor (TNF)-α, interferon (IFN)-α, IFN-β, IFN-γ, interleukin (IL)-6, and IL-10 concentrations in intestinal fluid. (B) Effect of Lr1505 or Lr1506 administration on CD3+CD8+IFN-γ+ and CD3+CD4+IFN-γ+ T cells from Peyer’s patches. The results represent data from three independent experiments. Significant differences between lactobacilli-treated and control groups * (P < 0.05) or ** (P < 0.01).