A H&E section from the lung of an infected animal showing no lesions at the humane endpoint, B CD3 stained section of the early lung lesion showing mild T-cells staining, C MAC387 stained section of the early lung lesion showing minimal macrophages/neutrophils staining, D stained section of the early lung lesion showing no bacterial antigen staining, E H&E section from the lung of an infected animal showing late lesions at the humane endpoint, F CD3 stained section of the late lung lesion showing mild T-cells staining, G MAC387 stained section of the late lung lesion showing severe macrophages/neutrophils staining, H stained section of the late lung lesion showing moderate bacterial antigen staining, I H&E section from the jejunum of an infected animal showing no lesions at 36 hours p.c., J CD3 stained section of the early jejunum lesion showing mild T-cells staining, K MAC387 stained section of the early jejunum lesion showing minimal macrophages/neutrophils staining, L stained section of the early jejunum lesion showing no bacterial antigen staining, M H&E section from the jejunum of an infected animal showing late lesions at 36 hours p.c., N CD3 stained section of the late jejunum lesion showing mild T-cells staining, O MAC387 stained section of the late jejunum lesion showing moderate macrophages/neutrophils staining, P stained section of the late jejunum lesion showing moderate bacterial antigen staining, Q H&E section from the mesenteric lymph node of an infected animal showing no lesions at 12 hours p.c., R CD3 stained section of the early mesenteric lymph node lesion showing moderate T-cells staining, S MAC387 stained section of the early mesenteric lymph node lesion showing mild macrophages/neutrophils staining, T stained section of the early mesenteric lymph node lesion showing no bacterial antigen staining, U H&E section from the mesenteric lymph node of an infected animal showing a moderate late lesions, V CD3 stained section of the late mesenteric lymph node lesion showing minimal T-cells staining, W MAC387 stained section of the late mesenteric lymph node lesion showing severe macrophages/neutrophils staining, X stained section of the late mesenteric lymph node lesion showing severe bacterial antigen staining. All images are x20 except E & I which are x10.