Ds1 and ds2 and I had pcr last Tuesday, ds1 pos myself and ds2 neg. I suspect ds1 had it the week before thinking about it as he was quiet and went to bed at 7pm two nights. I just assumed he was exhausted as he normally is at the end of term. Anyway I've tested ds2 and myself for 7 days always neg, and all 3 of us today (including ds1) we are all neg. Do I need to carry on doing this, we are out of isolation Friday.