Let it roll off dear, it is true that as children, we were more healthy, living on a farm and being exposed to all kinds of things, thus building immunities to disease, through coming in contact with them. There is a HUGE discussion on vaccinate vs breeding for immunity. No one is going to agree. One group believes vehemently one way, the other, just as much the other way...there is the same discussion going on about vaccinating children or not. You can talk to 20 different scientists and get 20 different views. don't let it get to you!!!
You must know the saying about an opinion, right?
Now biosecurity is a whole other discussion and I think most agree with practicing it!