Exactly. I've got a rather strong immune system - I believe last (school - I used to work at a school) year, I only called off four days.
Two days were in the summer, and were for attending a race.
One day, I actually was sick with something.
One day, I was insane. (Long story, part of which has already been posted somewhere on these forums, and after that day, was the day I quit that job, like a total idiot.)
I don't wash my hands after using other people's keyboards.