Evidence Shows Vaccines Unrelated to Autism

Claims that vaccines cause autism have led some parents to delay or refuse vaccines for their children. The most common claims are that autism is caused by measles-mumps-rubella (MMR) vaccine, vaccines that contain thimerosal, or too many vaccines. Many studies have been done to test these claims. None has shown that vaccines cause autism. This sheet lays out the facts to help parents understand why experts do not think vaccines cause autism.