My youngest (1) had chickenpox last week, it was pretty mild, and is all scabbed over and well on the way to disappearing. However my eldest (4) hasn't had it, and has no signs of having it. I've read that the incubation period can be 10 - 21 days which means that the latest he could get it would be the end of the month.
I also understand that he's contagious before the rash appears.
So, do I send him to nursery tomorrow?