Looks at the literal million dead Americans what survivors are we talking about again? If you got fired during the days where we finally had a vaccine and you refused to take it, you were fired for a very good reason.
"Get the vaccine to reduce your symptoms or I'll fire you incase it kills you!"
It's not like the vaccine prevents spread to other coworkers, why require it?
Everyone has a different health risk, let them decide whether they can weather a certain viral load.
That is, unless, you have a vaccine that can actually prevent trasmission.
Some of them… well, what an amazing coincidence really!