MMR and Autism

In light of the recent measles outbreak in Wales, I feel compelled to post an article on the subject of the MMR vaccine and autism. The first and most important thing to note here is that there is NO SCIENTIFIC EVIDENCE of any link between the combined MMR vaccine and autism. Please do take the advice of your local health board and make sure you have your child vaccinated. Measles is a serious disease with a high risk of nasty complications many of which are life changing (for example, deafness) or life threatening (for example, meningitis). No-one wants this for their child.

The reason that vaccination rates dropped dramatically in the 1990s and early 2000s is a small and now thoroughly discredited study by Dr Andrew Wakefield and his colleagues which resulted in a media frenzy around the suggestion that there may be a causal link between the combined MMR vaccine and autism. The key things to note about this study are:

  • It was a fundamentally flawed piece of work with a tiny research group of 12 children.
  • It did not even set out to study the effects of the MMR vaccine, a possible link was merely implied in the discussion.
  • Most of the authors have now retracted their involvement in the study.

Since the Wakefield study was published, there have been a variety of very large, scientifically sound studies which have categorically shown that the MMR vaccine is not a primary cause of autism. Key points of these studies are:

  • The number of cases of autism with and without developmental regression have continued to rise in countries like Japan where the combined MMR vaccine has been withdrawn.
  • There was no sudden jump in the number of cases of autism diagnosed after the MMR vaccine was introduced in the UK in 1988. The rise is smooth and gradual.

Almost all researchers now agree that, while autism is certainly being diagnosed more frequently, its causes are complex and unlikely to be down to one single factor, even from a genetic perspective.

You can find more information about MMR & Autism on the website of the National Autistic Society.