You may refuse anything you want.
I refuse what I want.
This is America.
I am free to make my own choice about my health.
I know enough to stay home if I am sick.
When it becomes physical, it becomes my choice.
HAHAHA If I tried to refuse income tax and guess what will happen? Armed govt agents will show up and haul my as to jail.
So there is no choice there.
As for any medical procedures, those should never be mandated by gov’t. Private outfits can set whatever rules they want to set to protect their workers, including medical requirements.