Fig. 1

Histopathological findings in pigs with (B, D) and without (A, C, E, F) post-weaning diarrhoea. A Marked epithelial autolysis with loss of cellular details and architecture (20×/0.50 NA, scale bar, 250 µm. B Haemorrhage (arrow) in the lamina propria and crypt abscesses (arrowhead) in the colon (40×/0.95 NA, scale bar, 250 µm). C Hyperplastic crypts with abscess formation invading Peyer’s patches in the ileum (40×/0.95 NA, scale bar, 350 µm). D Dilated crypts (c) and hypersecretion (*) near Peyer’s patch (p) in the ileum (10×/0.30 NA, scale bar, 300 µm). E Focal mononuclear cell infiltration (arrow) in the lamina propria of ileum (40×/0.95 NA, scale bar, 250 µm). F Luna stain showing red cytoplasmic granules within eosinophilic granulocytes in the ileum (40x/0.75 NA, scale bar, 120 µm)