Can employers require vaccinations as a condition of returning to work?

[Dutch Uncle]

I literally hate right to work laws, strongly support abolishing them, and virtually never side against unions,
but refusing to retain anti-vaxxer employees seems like a safety imperative to me.

Safety of all and legal liability are critical factors to consider in addition to good business management.

What employer/owner wants a major portion or all of their workforce waylaid by a highly contagious disease?

It'd be like a whorehouse banning condoms or allowing them to be optional. WTF?