It's not baffling at all.
Here’s an article concerning the history of mRNA vaccine research:
https://ifp.org/progress-deferred-le...e-development/
The bottom line is that mRNA is difficult and expensive to work with, there is very little money to be made on vaccines and most of the research prior to covid was in respect of trying to produce an HIV vaccine, which has proved to be incredibly difficult with traditional technology. Vast amounts of money was then thrown at covid and that funding allowed the technology to be developed.




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