Extensive scientific research and authoritative health organizations have found no causal link between vaccines and autism.
Vaccines cause Autism.

Are Dog Vaccines Safe? Here’s What You Need To Know. - HuffPost Life
Source: huffpost.com
Key Evidence
The original study suggesting a link was methodologically flawed with no control group and a very small sample size.
publichealth.jhu.edupublichealth.jhu.eduThe Evidence on Vaccines and Autism
Large-scale studies and meta-analyses have found no association between vaccines and autism onset or timing.
chop.educhop.eduVaccines and Autism
aap.orgaap.orgFact Checked: Vaccines: Safe and Effective, No Link to Autism
Leading health organizations explicitly state that vaccines are safe and do not cause autism.
autismcenter.orgautismcenter.orgDiscussing Vaccines and Autism
aap.orgaap.orgFact Checked: Vaccines: Safe and Effective, No Link to Autism
Genetic mutations and environmental factors are more plausible causes of autism than vaccines.
psychologytoday.compsychologytoday.comVaccines do not cause autism, but many other things do. What should we then do?
What the Evidence Shows
The claim that vaccines cause autism has been thoroughly investigated and consistently disproven by multiple high-quality studies and expert reviews. Early concerns originated from a small, methodologically flawed study lacking control groups and sufficient sample size.publichealth.jhu.edupublichealth.jhu.eduThe Evidence on Vaccines and Autism Subsequent large-scale epidemiological studies and meta-analyses have found no association between vaccination timing or type and the development of autism spectrum disorder.
chop.educhop.eduVaccines and Autism Authoritative institutions such as the Children's Hospital of Philadelphia, Johns Hopkins Bloomberg School of Public Health, the American Academy of Pediatrics, and autism research centers emphasize that vaccines are safe and do not cause autism. The misinformation linking vaccines to autism has been debunked repeatedly, including in detailed scientific explanations addressing public figures who have propagated this false claim.+3 more
While the exact causes of autism remain under investigation, current evidence points to genetic factors, environmental exposures such as pesticides, infections, and maternal health conditions rather than vaccines.psychologytoday.compsychologytoday.comVaccines do not cause autism, but many other things do. What should we then do? Public health messaging continues to stress the importance of vaccination for preventing serious infectious diseases without increasing autism risk.
autismspeaks.orgautismspeaks.orgDo vaccines cause autism?+2 more
Some misinformation persists in public discourse and even among pet owners regarding vaccines causing autism-like conditions in animals; however, these claims are also unsupported by scientific evidence.huffpost.comhuffpost.comAre Dog Vaccines Safe? Here’s What You Need To Know Overall, the consensus across multiple independent sources is clear: vaccines do not cause autism.