We now need to do more work on this. More people are developing Crohn's and other IBDs than in the 1970s, so we need to start looking at possible cures. Dr Montgomery said the combined impact of two childhood infections in rapid succession might prompt the immune system to turn against itself, leading in the long term to the development of IBDs. Both measles and mumps are known to reduce the strength of the immune system. IBDs are painful diseases affecting the intestine.
Sufferers often spend their lives going through periods of remission followed by relapse.
It may also cause inflammation or infection around the rectum. Ulcerative colitis usually causes ulcers in the lower part of the large intestine, often starting at the rectum. Both Crohn's disease and ulcerative colitis can be controlled by drugs and some patients have to undergo surgery to remove parts of the affected intestine. The BBC is not responsible for the content of external internet sites.