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Rich_G
The biotech/pfizer vaccine - uses newish technology but the tech has been around for a while. https://www.nature.com/articles/nrd.2017.243 Interesting article from 6 years ago.
What is being looked at is the effect of going in positive that everything will be fine. Remember the other vacines are older tech but we got rid of small pox and polio.
Flipside is covid seems to be having some long term side effects too.