To the original posters question.
Let's suppose I get contact with the virus, and become contagious, then get the vaccine,
then appear to recover from symptoms and treat the world as though I'm no longer contagious,
then put anyone around at more risk of exposure as, can we be sure a vaccine would stop someone innoculated from being contagious.
All we hear is this is a very transimissable thing, I don't think we hear an agreed upon time frame a person is conatagious,
Personally I've felt contagious to others since about, well when I learned of this in March, felt a bunch of us had it in December, and since I started taking temperatures have gone in and out of fever without many other symptoms. Such that.
If someone is contagious for months, and even possibly after vaccinated,
if everybody starts playing twister after inoculation day it could be bad.
(What! I was going to say "ookie mouth"
)