Too much sanitation is a lot like spraying insecticides, you kill off the good stuff too. Prior to starting my life in construction/farming work, any wounds I got on my hands got infected. Seriously, all of them! I washed my hands more times in a day than I could count. When I started working in the dirt all day, and wounds had to wait to be washed, the infections stopped. I can slice my hand open, feed the goats, clean the coop, weed the garden, and wait until I'm done to wash it off with no adverse affects.
Should we send them to school in bubble wrap?