That's how long it took for my daughter to catch something at school, bring it home, and infect everyone else in the house. Technically, it took her five days to catch something and three days to infect everyone else in the house.

This is another chance for me to point out that in the ten years before I had kids, I was sick twice. In the four years before Taryn started school, I got sick sick once. Since she started school two and a half years ago, I have been sick at least a dozen times.