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Comment by RandomLensman | original | Global review confirms mRNA vaccines are safe, effective and full of promise 
[−]RandomLensman · 2026-07-02 Thu 06:00 UTC · link
Don't know. But would standard smaller trials have captured it?

We are kind of back to my initial question that is conceptually unrelated to the vaccine trial: do you need trials to run into millions or billions of participants or into decades if you want to capture certain (rare) things?.