The Claim in Context
Some individuals wrongly assert there is a link between vaccines and autism. Before the claim was discredited, researchers took it seriously, investigated it thoroughly, and found no link. This research, in many countries, involving thousands of individuals, has spanned multiple decades. Any effort to misrepresent sound, strong science poses a threat to the health of children and does a disservice to our autistic community.   
Key Facts
- Immunizations work by prompting your immune system to recognize a virus or bacteria, so it will be ready to respond if it encounters it again. Immunizations are important to help children stay healthy, so they can learn, grow and thrive.   
- Scientific research confirms that vaccines are safe and effective. High rates of immunization stop preventable diseases from spreading through our families, schools and communities. 
- Studies have repeatedly found no credible link between life-saving childhood vaccines and autism. The original report claiming that the MMR (measles, mumps and rubella) vaccine causes autism was retracted due to fraudulent data, and the report’s author was sanctioned by scientific bodies and lost his license to practice medicine.
- Another misleading claim, which stems from this fraudulent and unethical report, suggests that receiving separate vaccines for measles, mumps and rubella would be safer than the combined MMR shot. Individual vaccines for measles, mumps and rubella have not been available in the United States since they were phased out of production in 2009. The MMR vaccine reduces the number of doctor’s visits and shots required for children to be fully protected.
- With routine screening, autism can be identified early, when children benefit the most from interventions like speech or occupational therapy, individualized educational plans, and family support.   
- Scientists are learning more about potential causes of autism all the time. One thing we know with certainty is that vaccines are not one of the causes. There is no single, root cause of autism. A combination of influences is likely involved. Certain genetic syndromes are associated with a higher likelihood of autism. In addition, some cases of autism may result from certain genetic changes interacting and affecting how cells function. Interactions between these genetic changes and environmental influences—such as premature birth, older parents, illness during pregnancy—also likely play a role.  
- The prevalence of autism has increased over time. Researchers and health care professionals who care for children with autism have explained this is likely due to multiple factors, including: people becoming more aware of autism, improved screening, and updated diagnostic criteria to include other conditions on the autism spectrum.  
Evidence Snapshot
Immunizations have dramatically reduced the incidence of vaccine-preventable diseases. The AAP rigorously reviews  vaccine safety and effectiveness data. The current U.S. childhood and adolescent immunization schedules are based on research showing when vaccines work the best to support children’s and adolescents’ immune systems.  
Professionals like pediatricians identify autism by carefully reviewing a child’s medical, social, family and developmental histories along with directly observing the child’s behaviors. Autism is often first identified in children between 12 and 24 months. This corresponds to many developmental milestones and temporally corresponds to key childhood vaccines giving some the false impression of a linkage between autism and vaccines. 
Why It Matters
We are all healthier when everyone who can get vaccinated does get vaccinated.  Misleading rumors can cause confusion and worry about vaccines, which could undo the great progress we’ve made in preventing serious childhood diseases. Additionally, misinformation about autistic children and false links to vaccinations does a disservice to them and their families. Because people keep repeating the rumor that vaccines are linked to autism, scientists continue to pour valuable resources into more studies, hoping to reassure the public. This sets back important work to improve care and expand opportunities for children with autism to thrive. 
Experts Say:
“Multiple studies from around the world have found no credible link between autism and vaccines. Continuing to push this false science poses significant risks to public health, particularly during one of the worst measles outbreaks in decades. It is also hurtful to the autistic community and a disservice to the thousands of autistic children and adults living rich, fulfilling lives.”
— Kristin Sohl, MD, FAAP
Resources for Further Information
Last Updated
12/04/2025
Source
American Academy of Pediatrics