Well, I'm not sure if this experience applies to the thread, but I thought I'd share it anyway...
I'm always afraid of getting sick, it's never fun and I remember getting sick quite a bit as a kid due to germs, stress or otherwise.
I make it a point to carry hand sanitizer with me at all times and I wash my hands regularly when I need to eat, etc. and avoid touching my face.
Despite all the precautions, I still got very sick after last year's con.
I don't really know if it was the 'con crud' I got from someone else or if it was anxiety-related, but as soon as I got home after the weekend, I had a horrible stomachache, felt feverish and had to, erm, occupy the loo for a bit. I was shaking and I was really scared that I had appendicitis or some virus and needed a hospital. But, thankfully, a good night's rest was all that was needed.
It's very important that everyone tries to take care of themselves, especially when they're so far away from home for a couple days.