VACCINE AFFECT

This study is often quoted as proof that MMR has nothing to do with autism, but its methods were too vague to rule anything out with confidence. It was a limited statistical exercise, not a definitive answer.

Different studies investigating the presence of measles virus in the intestines of patients with inflammatory bowel disease (IBD) or autism have produced mixed results, partly due to inconsistent laboratory techniques.

Epidemiological evidence lacked the precision to assess rare occurrences of a response to MMR leading to autism.