I'm not sure the money is worth it for him to make all those other people sick, but I generally feel that way any time we have a monster sickness in the house. He is self employed so can usually take a couple of days off if HE is sick.
However, if this thing goes round robin through all of us, there's no way we can stay in the house for a month or how ever long this takes.
It's unfortunate that there will probably be an economic impact from this flu when everyone can least afford it.
My husband works mostly from home, as long as he is well, he's fine with his phone and laptop. How the heck do you tell someone, you've got 3 kids, they're cycling through the flu so just stay home for, oh 3 weeks or so? What a nightmare!
I'm not sure I've heard of a flu which DOESN'T confer immunity. I'd guess your daughter could maybe act as a carrier, but I would think that once you've had it, you're done.
Hope all goes well! I'll be looking for updates.