HI Gr33nie! It's me from MDC!!
I agree with the pp, hand washing is very important, but I certainly never lived in a bubble - and I do think some germ resistance is good, though things like staph, PA and MRSA are not things you will build a resistance too. There are a lot of conflicting views here about how "protected" to keep kids - I was not kept from doing anything I wanted to do as a child and I didn't get PA until I was 28, and I have never been hospitalized. I played in dirt and went to public swimming pools and daycare and public school and all the controversial things that get discussed here - so you just never know. But I do think CF kids need to have as normal of a life as they can!!