there have been at least three studies done on autism and unvaccinated children [link to www.verywellhealth.com (secure)] and then the latest study from Denmark (of 95,000 children, with 15,000 unvaccinated children included) also says there is no relationship between the MMR vaccine and autism. Further, some unvaccinated children do, in fact, develop autism, and at the same rate as vaccinated children [link to www.statnews.com (secure)]