In an earlier post there was a discussion about leaky/compromised BBB. I am reading a book called "vaccine safety manual" for parents and practitioners, with a forward by blaycock, which I mentioned in that thread.

I have hit a part of the book discussing the disputed link between vaccines and autism, which has been in and out of the mainstream news media for years. Well, in this book, the writer, who has researched the subject of vaccines for twenty years, decided to see if a population where mass vaccinations were NOT in place had similar rates of autism. He went to the amish community, which shuns modern medicine and therefore does not vaccinate its newborns/children, and found only one case of autism, when he should have, statistically speaking, found at least 123. The most damning part: this lone case was a little girl adopted from China, who was vaccinated before entering this country.

I don't know that this information directly impacts on PD, it's just very interesting the mounting evidence of an unhealthy link between vaccines and neurological conditions (assuming PD is properly labeled such).