I actually kept a box of surgical masks, and if anyone felt at all like they could be catching something, they wore them. Also kept hand sanitizer by the door for people coming in. My friend who's Mom had lung cancer just didn't allow anyone in if they had been exposed to anything, but being with small children, you're always exposed to something. Try to get enough rest (I know that's next to impossible when stressed), eat well and give yourself some space. It will keep your immune system strong.