title: Inflammatory bowel disease: is it caused by an infectious agent? A look at some old and new theories.
mesh_terms: D000818:Animals; D001424:Bacterial Infections; D003093:Colitis, Ulcerative / Q000209:etiology* / Q000382:microbiology; D003424:Crohn Disease / Q000209:etiology* / Q000382:microbiology; D006801:Humans; D007422:Intestines / Q000382:microbiology; D014777:Virus Diseases