I'm by far no expert on vaccines, but this paper raises the question of whether those who received the mRNA vaccine have a higher risk of developing prion (mad cow) disease that basically turns your brain into a sponge and the possibility that it can be transmitted to others. https://scivisionpub.com/pdfs/covid19-rna-based-vaccines-and-the-risk-of-prion-disease-1503.pdf
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