Colony-forming units (CFU) of S. Typhimurium LT2 in the gnotobiotic piglets. S. Typhimurium LT2 CFU was counted in the jejunum, ileum, colon, and blood (all CFU/mL) and mesenteric lymph nodes (MLN), liver, spleen, and lungs (all CFU/g) in the piglets infected with S. Typhimurium LT2 for 24 h (LT2; red column) and the piglets monoassociated with B. animalis subsp. lactis and one week later infected with S. Typhimurium LT2 for 24 h (BB12 + LT2; violet column). Interferences between B. animalis subsp. lactis BB-12 and S. Typhimurium were evaluated by unpaired t-test. Statistical differences were marked with asterisks at p < 0.05. Log CFU are depicted as mean + SEM and n = 6 piglets for all groups.