http://www.slate.com/articles/health_and_science/medical_examiner/2015/09/donald_trump_ben_carson_and_rand_paul_are_wrong_on_vaccines_delaying_vax.html

Now Donald Trump is a vaccine expert. During last week’s Republican debate, he told the story of a child who got sick and became autistic after receiving a vaccine. Trump failed to provide any evidence that autism is connected to vaccines. That’s because there isn’t any evidence, because this concern has already led to many millions of dollars and multiple studies around the world over the past decade that have shown positively no discernable link between thimerosal-containing vaccines, the Measles Mumps Rubella vaccine, or any other vaccine and autism.