I'm surprised to hear how so few of you get sick....I wonder if there's a correlation between riding a motorcycle and having a stronger immune system. You're exposed to more elements, have higher rates of interaction with people and bacteria, wear gear that harbours bacteria (even if you're a germaphobe like me), etc.
I have a healthy immune system because when i was little i played in the dirt and my parents weren't scared of everything.
I wash my hands, I'm not a slob, but im about as far as one can get from being a germaphobe.