I don't mean to sound harsh, but after reading up for only a few minutes I've managed to find out quite a bit about this.
"In the UK, the MMR vaccine was the subject of controversy after publication of a 1998 paper by Andrew Wakefield et al. reporting a study of twelve children who had autism spectrum disorders and bowel symptoms, in many cases with onset observed soon after administration of MMR vaccine. During a 1998 press conference, Wakefield suggested that giving children the vaccines in three separate doses would be safer than a single jab. This suggestion was not supported by the paper, and several subsequent peer-reviewed studies have failed to show any association between the vaccine and autism. Administering the vaccines in three separate doses does not reduce the chance of adverse effects, and it increases the opportunity for infection by the two diseases not immunized against first. Wakefield has been heavily criticized on scientific grounds and for triggering a decline in vaccination rates, as well as on ethical grounds for the way the research was conducted.
In 2004, after an investigation by The Sunday Times, the interpretation section of the study, which identified a general association in time between the vaccine and autism, was formally retracted by ten of Wakefield's twelve coauthors. The Centers for Disease Control, the Institute of Medicine of the National Academy of Sciences, the UK National Health Service and the Cochrane Library review have all concluded that there is no evidence of a link between the MMR vaccine and autism."
I don't understand why so many people still seem to follow the media hype from ten years ago that's been repeatedly scientifically debunked by so many institutions?
AMETHYST