evidence: Authors of a meta-analysis review of 10 studies (5 cohort and 5 case-control involving over 1.25 million children looked at autism spectrum disorders (ASD), vaccines, the ingredient thimerosal (mercury) and the measles-mumps-rubella (MMR) vaccine. No causal association was found between vaccinations and ASD or between ASD and the MMR vaccine, specifically. In addition, no causal association was found between ASD and thimerosal (mercury). [...] Thimerosal and the Occurrence of Autism: Negative Ecological Evidence From Danish Population-Based Data [...] Autism and Thimerosal-Containing Vaccines: Lack of Consistent Evidence for an Association