Please let me know.
In the past, parents have been warned to avoid vaccinations with thermisol, a mercury-containing preservative, because of the link to Autism. However, the data was inaccurate and the research did not show this causal relationship. Check out this article: http://www.webmd.com/brain/autism/news/20110105/bmj-wakefield-autism-faq
Rest assured that if your child requires the MMR vaccine, you are causing no harm!