There is compelling scientific research showing that vaccines trigger autism for some kids. vaccinepapers.org describes how immune activation can cause autism, and discusses the heathy-user-bias in studies purporting to show no link.

James Lyons-Weiler's recent book, The Environmental and Genetic Causes of Autism, has surveyed over 2,000 scientific research articles, and concludes that vaccines are one of the reasons for the ongoing autism epidemic.