Table I.

Pathological score standard for intestinal tissues.

Score	Pathological changes
0	Complete intestinal villi and epithelia, normal tissue structures
1	Swelling and mild separation under the mucosal membrane and/or lamina propria
2	Swelling and moderate separation under mucosal membrane and/or lamina propria, edema under mucous membrane and/or muscle layer
3	Swelling and severe separation under mucosal membrane and/or lamina propria, edema under mucous membrane and/or muscle layer, focal villi absence
4	Absence of intestinal villi, bowel necrosis present