The Centers for Disease Control and Prevention (CDC) has made a dramatic change in its position on the relationship between vaccines and autism. The CDC’s website now says a link between vaccines and autism cannot be ruled out, which is contrary to the CDC’s longstanding stance that there is no link. The change comes even though a connection between vaccines and autism has long been debunked by a large body of high-quality research. U.S. Health Secretary Robert F. Kennedy Jr. has long promoted the discredited claim, and that appears to be the impetus for the revised CDC statement.
The CDC’s change has rung alarm bells among public health experts who are already worried about a drop in childhood vaccination, which has led to a resurgence of dangerous childhood diseases such as measles and whooping cough.
“The Centers for Disease Control and Prevention website has been changed to promote false information suggesting vaccines cause autism,” said Dr. Susan J. Kressly, president of the American Academy of Pediatrics, in a statement. “Since 1998, independent researchers across seven countries have conducted more than 40 high-quality studies involving over 5.6 million people. The conclusion is clear and unambiguous: There’s no link between vaccines and autism. Anyone repeating this harmful myth is misinformed or intentionally trying to mislead parents. We call on the CDC to stop wasting government resources to amplify false claims that sow doubt in one of the best tools we have to keep children healthy and thriving: routine immunizations.”
In a statement to NPR, Department of Health and Human Services (HHS) spokesperson Andrew Nixon repeated one of the changes to the website: “The claim ‘vaccines do not cause autism’ is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism.” Nixon also said HHS “has launched a comprehensive assessment of the causes of autism, including investigations on plausible biologic mechanisms and potential causal links.”
“The new statement shows a lack of understanding of the term ‘evidence,'” the Autism Science Foundation said in a statement the organization provided to NPR, adding, “No environmental factor has been better studied as a potential cause of autism than vaccines.”
It’s a statement that’s confusing by design, said Dr. Paul Offitt, a pediatrician and director of the Vaccine Education Center at the Children’s Hospital of Philadelphia (CHOP). “These are the usual anti-vaccine tropes, misrepresentation of studies, false equivalence,” he says. “They might as well say chicken nuggets might cause autism because you can’t prove that either.”
The changes on the website “blindsided” career scientists at CDC, says Dr. Demetre Daskalakis, a former top CDC official who resigned from the agency in August. “The scientists did not participate in its creation,” he says. “And the data are unvetted.”
Two current CDC staffers, who contacted NPR on November 20th, say the updates are a glaring red flag that indicate the vaccine information on the agency website is no longer credible, and is instead “anti-science.” They requested anonymity out of concern they could lose their jobs for speaking to the press.
Vaccine proponents say the moves are recklessly undermining public confidence in vaccines and fueling vaccine hesitancy, putting the nation’s children at risk. The U.S. appears to be poised to lose its status as having eliminated measles.
The CDC acknowledges in a footnote on its main webpage on autism and vaccines that it still carries a header reading “Vaccines do not cause autism*” and says it hasn’t “been removed due to an agreement with the chair of the U.S. Senate Health, Education, Labor, and Pensions Committee that it would remain on the CDC website.”
In a November 20, 2025 statement, the Chair of the Senate HELP Committee Bill Cassidy (R-LA) said, “I’m a doctor who has seen people die from vaccine-preventable diseases. What parents need to hear right now is vaccines for measles, polio, hepatitis B and other childhood diseases are safe and effective and will not cause autism. Any statement to the contrary is wrong, irresponsible, and actively makes Americans sicker.”
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