I let them know what illness is, and leave it up to them. Announced visitors, well you can't help that, but I'd let them know at the door that xxx is sick and see if they want to come in or not.
I usually let them know that they are sick and it's up to them if they want to expose themselves.
Unannounced visitors, I do the same as maz, go outside and say we are all sick, best to visit another time.
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