We have learned a lot about how the human body works. There is no plausible way that there could be something bad: the vaccine breaks down in the way RNA does withing minutes of entering the body. If anything bad happens because of RNA breakdown: you wouldn't have been born as RNA is basic to cell biology and breaks down as part of normal processes all the time.
The first mRNA vaccine went to phase 1 trials more than 10 years, which means we have a few people walking around who got a mRNA vaccine more than 10 years ago - if they got a side effect it wouldn't be noted. The sample size is of course too small, and it was a different vaccine, but there some long term safety data.
Anything is possible. My physics teachers like to point out that all the air in the room can teleport to the moon - but the odds of that are too low to worry about, even on the time frame of the universe.
The first mRNA vaccine went to phase 1 trials more than 10 years, which means we have a few people walking around who got a mRNA vaccine more than 10 years ago - if they got a side effect it wouldn't be noted. The sample size is of course too small, and it was a different vaccine, but there some long term safety data.
Anything is possible. My physics teachers like to point out that all the air in the room can teleport to the moon - but the odds of that are too low to worry about, even on the time frame of the universe.
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