There has never been a vaccinated/unvaccinated study - the government refuses to do one.  The argument is that it is unethical.   However it would be very possible to do a retrospective study as there are thousands of homeschooled children who are unvaccinated. A recent Yale study has found that the vaccinated have far more neurological disease.  Vaccine companies have no liability for any injuries vaccines may incur.  Dr. William Thompson still a chief scientist at the CDC has become a whistleblower and claims the CDC have covered up the fact that there is a sizeable increase in autism in African American children who receive the MMR before 18 months.  People please do your own research.