I found a potentially useful link re helping with immunity for tummy related things- the article does contain vocabulary that may bother people- V and D etc and some description of affects of virus. I tried posting message here with link but am unable to do so as haven't enough posts yet. If you type in 'products to take to build immunity to stomach bugs' into google and click on 'discussions' it's the fourth one down, an 'answer bag' post. Hope it may help xx