I recommend some reading concernjng mRNA vaccine trials that were done back in 2004. mRNA trials have actually been going on for decades and all were ceased due to safety concerns. Some of those concerns were from delivery method (which have apparently been fixed.) Other safety concerns are related to mRNA fragments making the cells do unintended things and virus immunity interference (what i found so far.)
The 2004 study was on ferrets:
https://www.sciencedirect.com/science/article/pii/S0264410X0500037X
And a summary:
https://www.cidrap.umn.edu/news-perspective/2004/12/sars-vaccine-linked-liver-damage-ferret-study
Basically a long-term effect was organ (liver) damage. Remember, the safety trials for the current vaccines were only 2 months long.
thanks
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