I kind of know I'm not being unreasonable but I am unbelievably shocked.
A friend is on holiday with her toddler and she has developed chicken pox. Diagnosed yesterday and they are still going to fly back on Saturday. I had assumed that there was no way an airline would let you fly.
Having had a mother who traveled back and forth from Spain between rounds of chemotherapy I find it appalling. When I mentioned this to her she said that's the risk you take when you travel! 
I know it's intrinsically none of my business, but I feel she's potentially putting lives at risk. But AIBU to feel annoyed.