I have checked some resources, namely those from the National Institute of Diabetes and Digestive and Kidney Diseases and they do not specify any bacterium or virus connection to Crohn's. They do, however, say that it is *theorized* that a bacterial or viral infection may trigger an immuno response that leads to Crohn's, *but* none have been proven. To check the cutting edge of Crohn's research, I would contact thr Crohn's & Colitis Foundation of America 1-800-932-2423. Kimberly Elms Arizona State University [log in to unmask]