you literally breath that shit right up when you crap anyway so what's the big deal? all this obsession, with keeping everything clean and disinfected, is doing is leading to weakened immune systems.
this reminds me of a friend of mine's wife. not entirely related, but similar enough. their son just started preschool, and he's gotten sick a couple of times already. so the mom is now super paranoid and i think she ended up pulling the boy out of the school until next year.
basically, instead of feeding him a good diet with the proper nutrients and exposing him to the "elements" so that he can build his immune system, she pulls him back into their sterile home, just so that the same thing will happen again next year. what's she going to do then? pull him out again? i understand that she's afraid, but come on.. common sense!