Website Edits Prompt Immediate Outcry
The CDC changed core sections of its website on Wednesday. The revisions question long-standing scientific findings about vaccine safety. The updated text suggests studies have not ruled out a link between vaccines and autism. Experts say these claims distort scientific evidence and mislead families.
Careful Wording Plants Seeds of Doubt
The revised bullet points argue that “vaccines do not cause autism” is not evidence-based. The phrasing implies major research gaps in infant vaccination studies. Specialists describe this as a tactic that fuels uncertainty. Alison Singer from the Autism Science Foundation stresses that science relies on consistent and repeated results. She explains that researchers cannot prove an absolute negative. She says they instead follow the weight of clear and converging evidence.
Singer emphasizes that studies overwhelmingly show vaccines do not cause autism. Her foundation notes that no environmental factor has been examined more deeply than vaccines and their ingredients.
Scientists Reject the New Claims
Pediatrician Paul Offit strongly disagrees with the updated language. He says science cannot prove “never,” but that limitation applies broadly. He warns that the same logic could cast false suspicion on everyday foods. A spokesperson from the US health department says the CDC page will reflect high-quality science.
A senior FDA commissioner told Sanjay Gupta in a recent podcast that he does not believe vaccines cause autism. He says no medicine is perfectly safe. He warns that extreme or absolute messaging weakens trust and confuses the public.
Studies Consistently Find No Link
The updated CDC page claims that authorities ignored studies suggesting a link. This is wrong. Research once claiming a connection was defective or fraudulent. Many rigorous studies show no relationship at all.
A major Danish study from 2019 followed more than 650,000 children. Around 6,500 later received an autism diagnosis. Researchers found no difference in autism rates between vaccinated and unvaccinated children. This pattern held across many variables, including family history and other vaccines. The authors concluded that the MMR vaccine does not raise autism risk.
Despite its importance, this study does not appear in the updated CDC summary. The site instead cites older reviews and questions aluminum. A Danish study published in 2025 found no link between aluminum in childhood vaccines and 50 medical conditions. The CDC page still argues that the data require further review.
The updated site also mentions a federal investigation into the causes of autism. Singer calls the effort wasteful. She says evidence points strongly to genetic factors linked to brain development before birth.
The main heading still states that vaccines do not cause autism. A footnote explains that it remains due to an agreement established during the health secretary’s confirmation process.
A senator later confirmed he spoke with the secretary about this issue. He says parents need clear and accurate information. He stresses that vaccines for measles, polio, and hepatitis B are safe and do not cause autism.
Experts Warn of Worsening Misinformation
Vaccine specialist Peter Hotez says the revised CDC page repeats false and disproven claims. He cites past misinformation about MMR vaccines, thimerosal, and aluminum. He calls the new content dangerous disinformation. He urges its immediate removal.
A former CDC immunization leader wrote that the edits are “a national embarrassment.” He says CDC scientists were not warned. He adds that decisions like these contributed to recent resignations. Other experts warn that such moves deepen mistrust in public health institutions.
Political Pressure Intensifies Vaccine Messaging Battles
The website changes reflect broader efforts by the administration to challenge long-established vaccine policy. The health secretary appointed advisers with long histories of opposing vaccines. Some have been criticized for unreliable research or professional misconduct. They now review government data to support conspiracy-focused claims.
Childhood vaccination rates across the US continue to fall. Measles and whooping cough are rising again. CDC specialists warned this week that the country may lose its status as free of continuous measles transmission.
