More and more studies are proving the link between the number of early vaccinations in infants and the incidence of autism. This has now been shown again by a large, cross-national study by the Italian National Research Council.
Source: tkp.at, Dr Peter F. Mayer, 19 November 2025
Many studies have already established a link between the ever-increasing number of infant and paediatric vaccinations and autism. An analysis of over 300 studies has recently confirmed this again. While there are several factors that contribute to autism spectrum disorders (ASD), immunisation has been shown to be the most significant modifiable risk factor. Any comparison between vaccinated and unvaccinated children shows dramatic chronic health differences in favour of the unvaccinated and the various biological mechanisms such as immune dysregulation, gut-brain axis involvement, neuroinflammation are now supported by hundreds of studies.
The study by Mario Coccia entitled “Infant Vaccine Scheduling Intensity and Autism Incidence: A Preliminary Cross-National Analysis to Guide Public Health Policy” covers several industrialised countries on three continents. It finds a remarkably strong association between early childhood immunisation intensity and autism prevalence. The number of vaccine types and doses administered before 12 months of age showed an exceptionally high correlation with national autism rates.
From the summary:
“This study examines the association between the intensity of immunisation scheduling in early childhood and autism prevalence in 12 high-income countries, with the aim of promoting evidence-based health policies. We investigated whether the number and timing of vaccine doses administered to infants under one year of age correlate with standardised autism incidence rates. Using cross-national data from countries with comparable health systems and diagnostic standards, we applied descriptive statistics, partial correlations (taking into account overall immunisation rates) and multivariate regression modelling. Countries with a higher autism prevalence (USA, Canada, Australia, Japan, South Korea, Singapore) administered an average of 15 vaccine types and 20 doses to infants under one year of age, while countries with a lower prevalence (Norway, Denmark, Finland, Italy, Sweden, United Kingdom) administered an average of 8 vaccines and 9 doses.”
A 1% increase in vaccine types before the age of 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 between countries.
Autism prevalence per 100,000 children served as the outcome, and overall immunisation rates were statistically controlled so that only vaccine intensity and timing were considered in isolation.
The results are striking and confirm the previous findings:
- Countries such as the US, Canada, Australia, Japan, South Korea and Singapore administer ~15 vaccine types and 20 doses before the age of one – and have the highest autism prevalence (~1,273 per 100,000).
- Countries such as Norway, Finland, Denmark, Italy and the UK administer ~8 vaccine types and 9 doses – and have significantly lower autism rates (~834 per 100,000).
- A 1% increase in vaccine types before the age of one corresponded to a 0.47% increase in autism prevalence.
Coccia then used a quadrant mapping to classify the countries:
- Critical risk zone: high vaccine intensity + high autism (USA, Canada, Australia, Japan, South Korea, Singapore)
- Protection zone: low vaccine intensity + low autism (Nordic countries)
- Transition zone: Countries that are on the way up with increasing vaccine intensity (Italy, United Kingdom)
Figure 1: Regression line of the autism rate as a function of the number of immunisations in infants ≤ 1 year of age, indicating the location of the countries studied. Note: Each quadrant is labelled with a political implication: Critical risk zone – high vaccine exposure and high autism rates; Protective policy group – low vaccine exposure and low autism rates, Transition risk zone – high vaccine exposure but currently low autism rates (Italy and UK); Emerging risk group – not represented in current data.
The bottom left quadrant contains countries with a lower number of immunisations for infants under 1 year of age and a lower autism rate (Norway, Denmark, Finland, Sweden). In contrast, the countries in the upper right quadrant have both a higher number of immunisations for infants ≤ 1 year (above the mean) and a higher incidence (above the mean) of autism per 100,000 population (Australia, Canada, USA, Singapore, Japan, South Korea). Italy and the UK are the only countries in the lower right quadrant, but it appears that they are approaching the countries with high autism rates.
The conclusion is clear: early and combined vaccinations are strongly associated with increasing autism rates.
