Could be, but unless it's accompanied by some kind of congestion at the very least, you've probably just got something in your nose.
I too have an enforcer friend who got sick. It's not really this bad every year: You'll notice that PAX wasn't a hotbed for colds or other contagious infections. Just swine flu. That's because we're already in the midst of a global swine flu epidemic, and there were flareups here in Washington prior to PAX. So, yeah, when that happens, it's a given, but the confluence of events to get us to that point is pretty rare.