A decreased mucus layer thickness and increased bacterial invasion into the inner mucus layer are well-known phenomena in IBD pathology.7 Our group has previously demonstrated that IgA-coated bacteria are inclined to encroach toward the intestinal epithelial cells and can cause intestinal inflammation in mouse models of colitis.8 One of these highly IgA-coated bacteria is a newly identified bacterium from the Allobaculum genus: Allobaculum mucolyticum sp. The gene discussed is CD79A; the disease is colitis.