A major storm has erupted in the public-health world after the Centers for Disease Control and Prevention quietly rewrote key language on its website, suggesting that a connection between vaccines and autism cannot definitively be ruled out. This represents a complete reversal of the agency’s decades-long—and unequivocal—position that no such link exists.
The move stunned experts because the scientific consensus on this issue has been settled for years. Research across multiple continents, involving millions of children, has thoroughly debunked the claim of any correlation. Nonetheless, Health Secretary Robert F. Kennedy Jr., who has been pushing this discredited theory for years, now appears to be steering federal health messaging in a dramatically different direction.
Public-health leaders warned that this sudden about-face lands at precisely the wrong moment. Childhood vaccination rates have already slipped nationwide, leading to the revival of illnesses once nearly eradicated, including measles and pertussis. They fear the new CDC language will pour gasoline on the fire.
“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. She emphasized the overwhelming scientific record, stating, “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.”
Dr. Kressly also criticized the agency’s direction in stark terms. “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.”
Federal officials, however, doubled down. In a statement to NPR, Health and Human Services spokesperson Andrew Nixon echoed one of the new website assertions: “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.” He said the department “has launched a comprehensive assessment of the causes of autism, including investigations on plausible biologic mechanisms and potential causal links.”
The Autism Science Foundation sharply rebuked that explanation, saying the revised wording “shows a lack of understanding of the term ‘evidence,’” adding, “No environmental factor has been better studied as a potential cause of autism than vaccines.”
Dr. Paul Offitt of the Children’s Hospital of Philadelphia said the new wording is intentionally confusing. He called it a repackaging of familiar misinformation tactics: “These are the usual anti-vaccine tropes, misrepresentation of studies, false equivalence,” adding pointedly, “They might as well say chicken nuggets might cause autism because you can’t prove that either.”
Inside the CDC, the shift triggered alarm and internal turmoil. Dr. Demetre Daskalakis—who left the agency over the summer—said the changes “blindsided” longtime scientists. “The scientists did not participate in its creation,” he explained. “And the data are unvetted.”
Two current CDC employees, who contacted NPR anonymously, echoed that the new language signals that the agency’s vaccine information is being distorted. They described the updated website as “anti-science” and said they feared retaliation for speaking out.
These developments are only the latest in a series of moves by Kennedy that run counter to the positions of leading medical institutions, including the Infectious Disease Society of America and the American College of Physicians. Vaccine advocates warn that the administration’s new posture threatens to undermine trust built over generations.
This year alone, Kennedy dismissed every member of the CDC’s powerful Advisory Committee on Immunization Practices (ACIP) and installed his own appointees. The newly reshaped committee quickly recommended eliminating thimerosal from the small subset of flu vaccines in which it still appears—despite years of evidence demonstrating its safety.
Federal agencies have also tightened access to COVID-19 vaccines and halted grants supporting new mRNA-based vaccines, cutting off development pipelines for future immunizations.
Alongside these moves, Trump administration officials have claimed a connection between acetaminophen and autism and touted leucovorin—a prescription form of vitamin B9—as a treatment for autism despite extremely limited evidence.
The current ACIP working group is evaluating additional sweeping changes, including removing aluminum-based adjuvants that have been safely used for nearly a century to boost vaccine effectiveness. They are also considering breaking up the single MMR shot into separate vaccines for measles, mumps, and rubella—decisions experts warn would dismantle a vaccination system that has shielded American children for generations.
The committee is even debating delaying the hepatitis B vaccine, which has long been administered at birth to prevent severe liver disease and cancer.
In an unusual twist, the CDC acknowledged in a footnote that its site still features the longstanding header “Vaccines do not cause autism*.” The asterisk notes that the phrase remains only because of “an agreement with the chair of the U.S. Senate Health, Education, Labor, and Pensions Committee that it would remain on the CDC website.”
NPR contacted the office of Sen. Bill Cassidy of Louisiana, who leads the HELP Committee and supported Kennedy’s confirmation, but received no immediate reply. Later in the day, Cassidy posted on X: “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.”
Public-health officials fear that unless the CDC reverses course, vaccination rates could continue to fall—jeopardizing herd immunity, reviving diseases long under control, and placing millions of children at risk.
{Matzav.com}
