On: Pfizer vaccine appears effective against mutation ...

[jonplackett]

How long do phase 1/2 take?

I wonder if, under some potential circumstances (eg. the virus turns out to escape current vaccine & be much more contagious) exceptions will be made.

[bluGill → jonplackett]

A few months. Though we don't have enough understanding of mRNA to skip phase 3 yet. That dull take time. How much time is a question of tradeoffs.