I worry about this stuff all the time. I've decided that while my daughter is little and it doesn't matter (like under 3 or so) and she doesn't know she's missing something, I'm going to err on the side of caution. But once she gets more aware and wants to be a part of things, I'm going to *cautiously* allow some of these things, because as Emily said, it doesn't make sense to me to lock my daughter in a room and disallow any fun just to preserve some health, especially when the same bacteria are everywhere. I'm going to try and focus on the things that seem to make more of a difference: being consistent with treatments, educating her, and keeping her weight on. But as I said, I understand your worry, because I have it too!!!!