Table I.

Intestinal tissue damage assessment scale as defined by Chiu et al.

Level	Microscopic findings
0	No mucosal changes
1	Despite Grunhagen changes in subepithelial region, villous structures are preserved and no cellular damage or inflammation
2	Lysis at cellular level, increase in gap between villous structures, and formation of Grunhagen in subepithelial region
3	Destruction of free villous structures, dilation at capillary level and inflammation at cellular level
4	Inflamed cells, necrotic material, bleeding, and ulceration due to near-total destruction of the villous structures
5	No visible structure other than amorphous material in the submucosal tissue and the entirely destroyed mucous membrane