DD1 has chickenpox. DD2 doesn't yet. I have found out that DD1 got it from nursery as she is the 7th case so it is highly unlikely DD1 and DD2 were exposed together.
DD1 got her first spots on Saturday evening. She would have been contagious to DD2 from 2 days before - Thursday.
If the incubation period is 10-21 days does this mean that DD2 is not contagious to other people until next Sunday? And can I send her to the childminder this morning?