"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.

WASHINGTON (AP) — The nation’s top health agency will undertake a “massive testing and research effort” to determine the cause of autism, Health and Human Services Secretary Robert F. Kennedy Jr. announced.

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).