"To organize a large-scale U.S. effort on behalf of autism and autism epidemiology will take a lot of time," researcher Walter Zahorodny told Newsweek.

For years, Robert F. Kennedy Jr. has raised questions about vaccine safety. Now, as the Secretary of Health and Human Services, Kennedy oversees the government’s key health agencies, including the Centers for Disease Control and Prevention (CDC) and the National Institutes of Health (NIH).