I would say I am obsessive about the hand washing....i think it's really helped avoid illness, but nothing is 100%.
Had one guy last week come back to work, shake my hand, and then proceed to tell me he was still fighting horrible flu and bronchitis. I thought "oh great...i really wanted to shake that hand". At work it always helps to have a coffee cup in one hand and a bunch of papers in the other and most wont stick out their hand for a shake seeing that you have no hands free. Leaving public bathrooms these days ya notice how many don't wash their hands? Church is about the worst for lots of handshaking.