Q: Does the measles, mumps and rubella (MMR) vaccine cause autism?

A: No. There is no evidence to suggest that the measles, mumps and rubella vaccine (MMR) can cause autism.

The exact cause of autism is still unknown.

Many high-quality scientific studies involving hundreds of thousands of children who have been vaccinated with the MMR vaccine have been carried out worldwide over more than a decade. None of these studies has found any link between the MMR vaccine and autism (or inflammatory bowel disease).

The original research findings suggesting such a link have also since been discredited. For more information, see our page Does the MMR vaccine cause autism?

Further evidence against any link between vaccines and autism comes from a recent US study. The study showed that total number of vaccines, or the number given on one day, makes no difference to a child’s risk of autism.