I didn't have my 5 year old daughter immunised because of the research, albeit scant. My reasons were actually ( I think) well thought out, and after explaining them, my Gp and Health Visitor would neither recommend or disapprove. Hence she has not been immunised, selfish maybe. But when I weighed up the potential risks to her, as her parent I felt that the risk to her health, was potentially greater than her being the cause of an outbreak or maintaining one that proved fatal to someone. Anyway my reasons were because of the risk of Crohns disease, not autism, this is massively on the increase, and I am hearing this from all kinds of different sources, with first hand accounts, from both professionals and sufferers or families. I know the MMR is not the sole cause of this, but it is linked, and throughout my pregnancy with her I had a severe bowel reaction to eggs, because the MMR triple vaccine is egg albumin based, I decided against it for her. My older two had it.