My 13-month old just started nursery and picked up chickenpox (fortunately really mildly) as there was an outbreak in his room. His elder brother (3 1/4) hasn't had chickenpox (well we don't think he has?!) and we are now on day 17 and he is showing no signs of getting it. I know the maximum incubation period is 21 days so he still has time, but was just wondering what the chances of him not getting it would be? Did your DC2 get it from DC1 or did they somehow escape it? I'm wondering about vaccinating him if he escapes it this time, but I assume if he does escape it it will be because he somehow has a level of immunity? Interestingly my husband also doesn't think he's ever had it (according to his mum), but he's showing no signs yet either. Interested to hear different experiences!