updated: Vaccination Reduces Risk of Alzheimer’s Disease, Parkinson’s
Only modestly interesting. 5.1% of vaccinated subjects came down with Alzheimer's during the 4-year follow-up vs. 8.6% of unvaccinated subjects. The mediating factor seems to be the herpes and chicken pox viruses: getting pneumonia or flu weakens your immune system so that these other viruses can attack your brain.
There are several essential oils that suppress the activity of these viruses, so another approach would be to apply these essential oils if you get pneumonia or flu.