An examination of scientific studies worldwide has found no convincing evidence that vaccines cause autism, according to a committee of experts appointed by the Institute of Medicine. In particular, no link was found between autism and the measles-mumps-rubella vaccine or vaccines that contain a mercury preservative called thimerosal. The committee released its eighth and final report yesterday in Washington. Some parents of autistic children immediately protested. Mark Blaxill, the father of an 8-year-old girl with autism, said the committee's conclusions were premature. Studies are under way that should not be dismissed, said Mr. Blaxill, who is a director of the...