Worth noting that many of my cow-orkers have school-aged children, but I also never get sick. In fact, 3 of them (including Mom and Dad, my cow-orkers) were sick with Influenza Type A last week when I was sitting at their house, completely surrounded by them, for Thanksgiving dinner!

FWIW, I also attribute never having missed a day of school or work due to illness in my entire 43 years of life (and 18 years of worklife) to ingesting no man-made pharmaceuticals whatsover.