Can anyone please offer any advice on two issues? My family have had one illness after another for the last two months culminating in a particularly nasty bout of flu. My two girls have been in bed for a week and are wiped out. My queries are, how can I best boost their immune systems and, how long (if at all) should I avoid contact with other groups of children? They are both under three and I am seriously considering keeping them in until puberty ?!!!