Dose response of L. reuteri on S. enterica serovar Typhimurium-induced IL-8 production. L. reuteri at a concentration of 0.1 × 107 (LR1, 1 bacterium/cell), 0.5 × 107 (LR5, 5/cell), or 1 × 107 (LR10, 10/cell) cells/ml was used. Significant inhibition by L. reuteri of S. enterica serovar Typhimurium (ST)-induced IL-8 secretion occurred at 1 × 107 cells/ml. M, media control; **, P < 0.01, compared to serovar Typhimurium control (n = 3). LR, L. reuteri.