In an unprecedented reversal of decades-old public health guidance, the Centers for Disease Control and Prevention has updated its website to suggest that science doesn’t support the claim that vaccines don’t cause autism — a change personally directed by Health and Human Services Secretary Robert F. Kennedy Jr.
The CDC’s website, long considered the gold standard of public health information, now states that the phrase “Vaccines do not cause autism” is “not supported by science,” according to documents reviewed by multiple news organizations. The update further suggests that health authorities have overlooked studies supporting a potential link — a position that contradicts the overwhelming scientific consensus.
Kennedy’s direct intervention
“The whole thing about ‘vaccines have been tested and there’s been this determination made,’ is just a lie,” Kennedy said in defense of the changes. The controversial HHS secretary, who built his pre-political career partly on vaccine skepticism, personally directed the CDC to make the changes without consulting the agency’s career scientists.
The revised guidance blindsided many CDC staffers, who were not involved in drafting the new language that contradicts years of their own research. In a peculiar compromise, the CDC’s website still features the header “Vaccines do not cause autism” — but now with an asterisk noting this remains only due to an agreement with the Senate Committee on Health, Education, Labor, and Pensions, as reported by Axios.
What makes this revision so extraordinary? It represents a dramatic departure from scientific consensus established through numerous large-scale studies conducted across multiple countries over decades.
Scientific community pushback
The reaction from the medical establishment has been swift and forceful. “This is madness. Vaccines do not cause autism, and unfortunately, we can no longer trust health-related information coming from our government,” declared Dr. Sean O’Leary, who heads the infectious diseases committee at the American Academy of Pediatrics.
Senator Bill Cassidy, a physician who chairs the Senate health committee, has emerged as one of the most vocal critics of Kennedy’s actions. “Any statement to the contrary is wrong, irresponsible, and actively makes Americans sicker,” Cassidy stated, referencing the longstanding scientific consensus on vaccines and autism.
The Autism Science Foundation has also condemned the CDC’s updated guidance. “No environmental factor has been better studied as a potential cause of autism than vaccines. This includes vaccine ingredients as well as the body’s response to vaccines. All this research has determined that there is no link between autism and vaccines,” the organization affirmed.
Broader pattern of vaccine policy changes
The website revision isn’t an isolated incident. Since taking office, Kennedy has orchestrated a series of dramatic shifts in federal vaccine policy, including pulling $500 million previously allocated for vaccine development, replacing all members of a federal vaccine advisory committee, and firing the CDC director over vaccine policy disagreements, according to Politico.
Kennedy, for his part, acknowledges that specific studies have found no link between autism and thimerosal (a mercury-based preservative once used in some vaccines) or the MMR vaccine. However, he insists there are significant gaps in vaccine safety science that require further investigation.
The controversial website change comes at a sensitive time for public health messaging in America. Trust in health institutions has already been strained by the pandemic, and experts worry this reversal could further erode confidence in childhood immunizations, potentially leading to outbreaks of preventable diseases.
For parents seeking reliable information about their children’s health, the CDC’s about-face creates a troubling dilemma: whether to trust the current administration’s interpretation of science or the decades of peer-reviewed research supporting vaccine safety. Meanwhile, rates of measles, mumps, and other preventable diseases — once nearly eradicated in the United States — have begun creeping upward as vaccination rates decline.
