There was no significant difference in the expression of intestinal epithelial tight junction proteins between the mock and AL groups (P > 0.05), while AL treatment in the infection group could upregulate the ZO-1 and Occludin, as compared with the infection group (P < 0.01 and P < 0.05), indicating that AL can protect the structure and function of the intestinal epithelial mucosa to a certain extent. This evidence concerns the gene OCLN and infection.