Infant Vaccine Intensity Strongly Predicts Autism Rates Worldwide
November 19th, 2025Via: Focal Points:
A new cross-national study from Italy’s National Research Council, spanning multiple developed countries across three continents, has identified a remarkably strong association between early-life vaccine intensity and autism prevalence. The number of vaccine types and doses administered before 12 months showed exceptionally high correlations with national autism rates.
A 1% increase in vaccine types before age one corresponded to a 0.47% increase in autism prevalence.
The correlation is enormous — r = 0.87 for vaccine types and r = 0.79 for vaccine doses. In regression models, vaccine intensity alone explained 81% of the variance in autism prevalence across nations.
This is not an isolated signal. It directly corroborates earlier U.S. state-level data from DeLong (2011) — and aligns with the 107 positive-association studies catalogued in the McCullough Foundation’s Landmark Autism Report.
