I'm a nurse and when I was working, I never had strep or the flu or anything. I was in peoples faces all day around the stuff running tests and such and never once caught it. I guess once you get enough of anything in your system, you are immune to it. My 3 year old is at this very moment outside running barefoot thru the pasture and playing in what's left of the dump truck load of sand we had brought in Friday. She is never sick either by the way. I am a firm believer in washing your hands, but you can wash anything too much. We also do not use antibacterial soaps because it kills the good bacteria on your skin that helps keep the bad stuff away. A far as no pets, that ridiculous. I got salmonella from my iguanas when I was in college and guess what, it didn't kill me!