I had chickenpox as a child and know I am definitely immune to it, as I've been tested previously and have evidence of antibodies. We're having some visitors soon who have been in contact with a child with chickenpox, though I'm sure they have both also had chickenpox previously. I was fine with this, but it's now been suggested by a family member that this isn't such a good idea. I'm not being irresponsible am I?