For followers of medical disinformation, the claim that autism is linked to childhood vaccinations is the reddest of red flags. The issue is among the most intensively studied in the scientific literature, and the results among the most conclusive: There’s no connection.

That’s why the revision by the Centers for Disease Control and Prevention of its advisory on vaccines and autism struck like a thunderbolt, and not in a good way. The original statement was this:

“Studies have shown that there is no link between receiving vaccines and developing autism spectrum disorder ... No links have been found between any vaccine ingredients and ASD.”

Now, the statement says: “The claim ‘vaccines do not cause autism’ is not an evidence-based claim because studies have not ruled out the possibility

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