ds first spots started to show last friday morning and seemed to increase gradually on saturday and sunday. he has really suffered, crying and hardly sleeping at night, coughing alot. he is alot better today, less scratching but still lots of spots which are mainly crusting over with scabs (nice). some spots are causing him issues and haven't scabbed yet. my question is: when does he become non-contagious to others (cos we are both going crazy stuck at home), and when can i send him back to pre-school? any advice appreciated, thanks!