The one thing that is easiest to share is the one thing that nobody wants to share: illness. Wherever people come together to interact, it seems impossible to avoid the spread of bacterial and viral infections.
We witness and experience the domino effect of illness everywhere: Someone gets sick at work, and before you know it, half the office is taking turns being out on sick leave. This is brought home, and in the blink of an eye, the entire family is taking turns getting sick. A child takes it to school, and like wildfire, it soon spreads among other classmates. And this can continue in what may seem like a never-ending cycle.