I agree with texol and burbie,
I grow up on and around farms, was always feed fresh food straight out the ground as a child, I have drunk milk taken straight from the milking "bucket" and have probably eaten more than my fair share of dirt.
In fact my childhood would have horrified some of the "bleach everything" parents of today... but I'm now nearly 36 and the only time I can remember ever going to my doctors is when I have physically damaged myself. I can not remember actually being ill other than I slight cold which is no big deal.
Though I do put some of it down to modern attitudes, people will phone in sick for work these days because their little finger aches a little so I "pull a sicky"