Dozens of studies have failed to find evidence of a link. The decision to re-examine the question comes as a measles outbreak, driven by low vaccination rates, widens in Texas.

President Donald Trump and HHS Secretary Robert F. Kennedy Jr. have repeatedly raised the idea that autism could be linked to vaccines.

The US Department of Health and Human Services asked the US Centers for Disease Control and Prevention to study vaccines and autism, a person familiar with the situation told CNN, despite strong evidence that vaccines do not cause autism.

The Centers for Disease Control and Prevention (CDC) will be conducting its own study into whether vaccines cause autism, despite reams of past research failing to prove any links. In a statement to ABC News,