So my doctor tells me tonight, that I need to let my daughter be exposed to things like norovirus...because that way she can build up immunity toward it and help her out. Umm all my reading tells me that every strain of norovirus is different and thats why they can't make a vaccine for it. So....how would exposing her to it , give her immunity?.....she says that because i avoid places where people have noro, and i make her wash her hands, and use Germstar hand sanitizer when i know there is a noro outbreak.....