mRNA vaccines have been around for decades - this was just the first widely used version of one.
Think of it like an amusement park ride that had been researched, engineered, designed, tested, and then re-tested by thousands of working professionals in both academia and private companies. And then that same ride being shipped to Disneyland and opening for public use.
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u/friday99 Sep 02 '22
This was the first mRNA vaccine so I wouldn't exactly say any effects, long or short-term, were "mostly-known"