I had a parent who died in their mid-50’s due to auto-immune disease and a sibling who suffered early in childhood from the same.
I am an otherwise healthy, fit person in my 30’s who has thought long and hard on this over the past year and am at a point of not being willing to get the vaccine yet.
The “unknowns” of what - if any - long term side effect could occur sound all too familiar to me from every medical expert. I don’t say that disparagingly; just honestly. Numerous interventions were assured to be suitable for my family parent, all of which had been in use longer than the pandemic has been around, and we were assured of no long term issues.
The fact of the matter is that you cannot know what you do not know. And I readily admit the same holds true of the virus itself (ie we do not yet know what the long term effects may be).
Why do I say all this? To the OP: unless you’re willing to sit down and have that conversation with each individual employee then mandating vaccination for continued employment would be short sighted.
What do we know about the vaccines thus far? They work great at preventing you from getting the virus. Which means you’re in one of two camps: being willing to get the vaccine in order to nearly eliminate your risk of contracting the virus, or choosing not to and be ok with assuming that risk.
We are quickly reaching a point where everyone that wants the vaccine has either gotten it or can get it and everyone who does not has accepted the risk they assume by not. So where does the risk come in from those who have not had it to those who have in your workplace?