Multiple health organizations and scientific outlets flagged a revision to the CDC’s vaccine safety web content that introduced language suggesting uncertainty about whether vaccines can cause autism. The update, widely reported and criticized, departs from the agency’s longstanding statement that research has found no causal link between routine childhood vaccines and autism. Healthcare societies, pediatricians and epidemiologists condemned the change as misleading and warned it could reduce vaccine confidence and uptake, potentially increasing preventable disease risk. The Department of Health and Human Services has said it will pursue further assessment of autism causes, but critics said the site update conflates active investigation with established evidence and undermines public trust. The controversy has regulatory and policy implications: industry groups and public‑health stakeholders will watch whether the CDC revises the page, how HHS frames further studies, and whether the shift affects vaccination campaigns during coming respiratory virus seasons.