The underlying argument has not changed: Vaccines harm America’s children, and doctors like Paul Offit are paid shills of the drug industry. To be clear, there is no credible evidence to indicate that any of this is true. None. Twelve epidemiological studies have found no data that links the MMR (measles/mumps/rubella) vaccine to autism; six studies have found no trace of an association between thimerosal (a preservative containing ethylmercury that has largely been removed from vaccines since 20011) and autism, and three other studies have found no indication that thimerosal causes even subtle neurological problems.