http://medicalxpress.com/news/2015-01-viruses-unexpected-role-inflammatory-bowel.html
immune system and gut bacteria
http://medicalxpress.com/news/2015-01-immune-digestive-health-fostering-good.html
Old Mike
http://discover.umn.edu/news/science-technology/people-may-inherit-gut-bacteria-cause-crohns-disease-and-ulcerative-colitis
http://www.ncbi.nlm.nih.gov/pubmed/25619688