WHO Confirms Long-Standing Conclusion: No Vaccine-Autism Link

The World Health Organization (WHO) has reiterated that there is no scientific evidence linking vaccines to autism spectrum disorder. On October 26, 2023, the WHO’s Global Advisory Committee on Vaccine Safety reviewed recent studies and confirmed conclusions that have been established for over two decades.

The committee evaluated two systematic reviews analyzing research published between 2010 and August 2025. These reviews focused on vaccines in general, including those containing thiomersal, a mercury-based preservative that has faced scrutiny from critics alleging it may contribute to autism. Scientific research has consistently dismissed these claims.

According to the committee, establishing a causal link between vaccines and health outcomes requires multiple high-quality studies that demonstrate a consistent statistical association. In their findings, 20 out of 31 studies assessed showed no evidence of an association between vaccines and autism.

Methodological Flaws in Studies Suggesting a Link

The committee identified that 11 studies proposing a potential link were marred by significant methodological flaws and were deemed to have a high risk of bias. This reinforces the committee’s assertion that claims linking vaccines to autism lack robust scientific backing.

Additionally, the WHO’s findings come at a time when misinformation regarding vaccines is prevalent, particularly on social media platforms. A recent investigation by Marketplace examined 200 health videos on TikTok, finding that many contained misleading information about treatments for autism and cancer.

The issue has gained further attention following remarks made by U.S. Health Secretary Robert F. Kennedy Jr., who claimed in an interview with the New York Times that he directed the Centers for Disease Control and Prevention (CDC) to alter its long-held position on vaccines and autism. This statement has sparked debate and concern among public health officials.

The WHO’s reaffirmation of the lack of a link between vaccines and autism is critical in countering ongoing misinformation. Public health experts emphasize the importance of vaccinations in preventing disease and protecting community health, underscoring the need for continued public education and outreach.

As the conversation about vaccine safety evolves, the WHO remains committed to providing clear, evidence-based information to combat misinformation and support public health initiatives worldwide.