Stay happy and forget getting a cold

Do you know people who seem to be bypassed by every cold, flu and other home or office bug with nary a sneeze or fever? Those people always exist, and we can't help but be jealous. What makes them that way?

A growing body of research suggests that personality, stress and social life all can have an effect on the susceptibility of many adults to contract cold virus symptoms.

In other words, if you're a stress-free person with a good demeanor and a healthy social life, you may not have as many colds (and symptoms) as the depressed and stressed out co-worker a cube away. The research that supports this is here. What do you think?