Quick Followup: Autism and Vaccines

by Karl Denninger

Folks, let’s be clear: Autism is almost-certainly not caused by vaccines.

Let’s remember the first rule of observational studies, which incidentally I was surprised to find a few years ago in my daughter’s High School intro-to-stats class: Observational studies can only show correlation and correlation cannot prove causation.

However, the absence of correlation is damn near bomb-proof evidence that the alleged cause you believe exists is false.

Measles vaccination in the US began in 1963 following approval in 1962. Within five years near-complete compliance was obtained within the US. MMR, the combined vaccine that people like to blame autism on, replaced the single measles vaccination in 1971. MMR is typically given at approximately age 1, with a second dose before starting school.

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