Dozens of studies have found no link between autism and childhood vaccines. Allen J. Schaben/Los Angeles Times/Getty Images

Until last week, parents who looked at the US Centers for Disease Control and Prevention’s website on autism and vaccines would see a few key points: Studies have not found links between vaccines and autism , nor have links been identified between any vaccine ingredients and autism.

At the direction of US Health and Human Services Secretary Robert F. Kennedy Jr. , a longtime anti-vaccine activist, the CDC page now has a different message: “Scientific studies have not ruled out the possibility that infant vaccines contribute to the development of autism.”

HHS said the change was made to “reflect gold standard, evidence-based science.” But it drew a swift and s

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