Evaluation of B and T cells in ileum tissue. At 14, 21 and 28 dpi, both B cells and T cells were evaluated in the terminal ileum of all animals. The distribution of B cells was evaluated and given the score of either 1: focal distribution, 2: multifocal distribution, 3: multifocal-to-diffuse distribution, 4: diffuse distribution. T cells were counted in 30 infected and 30 non-infected crypts per animal. A Distribution of B cells in lamina propria. B Number of T cells per infected crypt. C Number of T cells per non-infected crypt. Error bars represent standard error. Different letters indicate statistical significance (p < 0.05).