For example BSE[0] is an infectious disease believed to be due to a misfolded protein, known as a prion. The time between infection and onset of symptoms is fou

For example BSE[0] is an infectious disease believed to be due to a misfolded protein, known as a prion. The time between infection and onset of symptoms is four to five years. So if you got "infected" by prion 4–5 years after you will notice first symptoms and then you will die within weeks to months. There is no treatment for this disease. In the context of mRNA vaccine if you feel good 1 month after getting the mRNA vaccine or if you feel okay after 1 year means nothing because biological processes are slow but when they kick in they hit hard. Edit: I gave the example with cows a human variant is Creutzfeldt–Jakob disease and onset of symptoms can happen years to decades after exposure. Average life expectancy following the onset of symptoms is 13 months. [1] [0] https://en.wikipedia.org/wiki/Bovine_spongiform_encephalopathy https://en.wikipedia.org/wiki/Bovine_spongiform_encephalopat... [1] https://en.wikipedia.org/wiki/Variant_Creutzfeldt%E2%80%93Jakob_disease https://en.wikipedia.org/wiki/Variant_Creutzfeldt%E2%80%93Ja...