I dont want to jinx it, but my eldest daughter and I always have colds, she seems to be very prone to skin infections too, but I have only ever had noro twice and her 1 time and she only v once. On the other hand my middle child never gets much in terms of illness, although shes only had noro once it was quite severe and lasted almost 3 weeks on and off, so I just think everybody handles all sorts of different illnesses differently. My OH has had more v* like illnesses than me and my 3 children put together, but he NEVER gets colds or the like.