New guidance published by the US Centers for Disease Control and Prevention (CDC) suggesting vaccines may cause autism has been slammed by medical and autism advocacy groups.

A CDC webpage which previously stated there was no link between vaccines and autism was changed on 19 November. 1

The page now reads, “The claim ‘vaccines do not cause autism’ is not an evidence based claim.”

The revised webpage—part of a resource aiming to provide the public with science backed information on health matters—goes on to say, “Scientific studies have not ruled out the possibility that infant vaccines contribute to the development of autism.” It says that historically the CDC and other federal health agencies have told the public that vaccines don’t cause autism to “prevent vaccine hesitancy.”

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