New analysis from a WHO global expert committee on vaccine safety has found that, based on available evidence, no causal link exists between vaccines and autism spectrum disorders (ASD). The conclusion reaffirms WHO’s position that childhood vaccines do not cause autism.

The Global Advisory Committee on Vaccine Safety (GACVS), established in 1999, brings together international experts to provide independent and authoritative scientific advice to WHO on global vaccine safety related priorities.

The latest analysis, discussed by the Committee on 27 November 2025, focused first on the relationship between thiomersal-containing vaccines and ASD, and the association between vaccines in general and ASD. Evidence based on 31 primary research studies, published between January 2010 and August 2025, including data from multiple countries, strongly supports the positive safety profile of vaccines used during childhood and pregnancy, and confirms the absence of a causal link with ASD.