Current animal models of AIEC include mice that express the human carcinoembryonic antigen-related cell adhesion molecule 6 (CEACAM6) receptor (CEABAC10 mice), conventional mice treated with broad-spectrum antibiotics, mice treated with colitis-inducing agents [dextran sulfate sodium (DSS) and 2,4,6-trinitro-benzene sulfonic acid], and mice that are genetically susceptible to spontaneous colitis (8, 9). This evidence concerns the gene CEACAM6 and colitis.