One of the joys of being a classroom teacher is that you are exposed to every form of plague possible every Monday morning.  Flu shots? Why? by the time I get one, I’ve already had it 3 times.  About once a year I tend to get some kind of bug, about once every 5 years I get a bug that hits me really hard, hard enough for me to stay home.  The bad part is I usually don’t know about it until about halfway through the school day.