“Vaccines cause autism.”

The widely circulated idea that vaccines cause autism originated primarily from a fraudulent study published in 1998 by British physician Andrew Wakefield. This paper, published in the prestigious medical journal The Lancet, suggested a link between the measles, mumps, and rubella (MMR) vaccine and the development of autism, based on observations of a small group of children. What was not disclosed at the time was Wakefield's significant conflict of interest, including receiving payments from lawyers involved in lawsuits against vaccine manufacturers and holding a patent for a rival measles vaccine.

The scientific community quickly raised concerns about Wakefield's study due to its small sample size, lack of control groups, and methodological flaws. Subsequent investigations revealed that Wakefield had falsified patient data and acted unethically, leading to the full retraction of the paper by The Lancet in 2010. Furthermore, British authorities revoked Wakefield's medical license. Since this discredited report, numerous large-scale epidemiological studies conducted across different countries have consistently found no causal relationship between the MMR vaccine, thimerosal (a preservative once used in some vaccines), or the number of vaccines given, and autism. Major global health organizations, including the World Health Organization, have repeatedly reaffirmed the safety and effectiveness of vaccines, concluding that there is no evidence linking them to autism spectrum disorders.

Despite the overwhelming scientific consensus, this myth persists for several reasons. Autism symptoms often become noticeable in early childhood, around the same time children receive routine vaccinations, leading some parents to mistakenly perceive a causal connection due to timing alone. The understandable desire for parents to find an explanation for their child's autism, coupled with the spread of misinformation and distrust in established medical institutions, has allowed the myth to endure. This continued belief poses significant public health risks by contributing to vaccine hesitancy and the resurgence of preventable diseases.