Some doctors (like Dr Tenpenny I believe) believe that the vax can cause prion diseases.The idea is that it crosses the blood brain barrier, which by itself is terrible news, then it can can cause normal tau proteins to get misfolded into prions by acting as a template,

I think this is correct. I also think that a healthy person probably has a certain number of misfolded proteins (prions) and the body cleans them up, but when it gets too many, it's a downward spiral to dementia.

Some doctors (like Dr Tenpenny I believe) believe that the vax can cause prion diseases.The idea is that it crosses the blood brain barrier, which, by itself is terrible news, then it can can cause normal tau proteins to get misfolded into prions by acting as a template,

I think this is correct. I also think that a healthy person probably has a certain number of misfolded proteins (prions) and the body cleans them up, but when it gets too many, it's a downward spiral to dementia.