I have an off-the-cuff discussion with two lawyer friends about whether a parlour owner would be legally liable if a client contracts Delta through his unvaccinated girl.
None of them wants to be definite about it as it's a very new scenario.
It would be an iffy case remotely similar to if you have food poisoning after eating in a restaurant but the evidence is more difficult to prove.
They walked away saying, "We need to study it."