Is there any evidence that MMR or thimerosal causes autism?

No. This issue has been studied extensively, including a thorough review by the independent Institute of Medicine (IOM). The IOM issued a report in 2004 that concluded there is no evidence supporting an association between MMR vaccine or thimerosal-containing vaccines and the development of autism. For more information on thimerosal and vaccines in general, visit www.cdc.gov/vaccine-safety/about/thimerosal.html.