The largest clinical study of its kind is revealing new insights into the causes of Crohn's disease, a periodic inflammation of the intestines. The research, which involved 668 children, shows that numbers of some beneficial bacteria in the gut decrease in Crohn's patients, while the number of potentially harmful bacteria increases. Ramnik Xavier, the Kurt J. Isselbacher Professor of Medicine in the Field of Gastroenterology at Massachusetts General Hospital, led the study.
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