Here's one response to this paper. https://sciencebasedmedicine.org/can-mrna-based-covid-19- https://sciencebasedmedicine.org/can-mrna-based-covid-19- vaccines

Here's one response to this paper. https://sciencebasedmedicine.org/can-mrna-based-covid-19- https://sciencebasedmedicine.org/can-mrna-based-covid-19- vaccines-cause-prion-disease/ It concludes (regarding the claim) that "mRNA-based COVID-19 vaccines can cause prion disease leading to neurodegenerative diseases like Alzheimer’s dementia. What are prions, and can these vaccines cause prion disease? (Spoiler alert: The answer to the second question is almost certainly no. It’s speculation based on highly implausible biology.)" Classen is correct in one respect at least: "the current RNA based SARS Cov-2 vaccine has been approved in the US on emergency order without long term safety testing." But I think we all know that and understand why.