Is there such a thing as "vacation crud?"

Because I came back from vacation, started to feel lousy last night, and ended up going home early today and falling face-first into bed because I seem to have acquired a cold. I have no idea *why* since I haven't been around any sick people lately, but after I started to get dizzy this afternoon and three separate people heard me sneezing and said "you need to go, I'll cover for you," well, who was I to tough it out?

I'm about to take a hot bath and slug down some Nyquil. Colds SUCK.