[dr_faustus]

The have to go through an approval process on every update but AFAICR only with a study including 300 adults, so substantially less then the tens of thousands that were included in the Biontec/Moderna trails.

[usrusr]

Thanks. So they only test for lack of side effects, not for effectivity (outside of leech dish experiments), because with just 300 it would take decades to see a meaningful delta? (unless they do challenge tests?)

[waiseristy]

You think the mRNA vaccines with minimal changes be treated similarly? e.g one years flu cocktail, vs the next?