Maybe, or maybe whatever has infected your lungs is nastier this year than normal. It seems that I've been sicker, longer the last few years, and I'm pretty healthy, young enough, fit enough, but I get exposed to sick people a lot so I get their nastiness...I tell you the best thing about being off injured for the last 3 months (not that it hasn't sucked, it has) has been not being around other staff getting me sick, customers getting me sick, etc...

Did you move somewhere and maybe it's environmental too. Since we've moved to a drier climate, it seems harder to shake respiratory infections vs. when we lived in a much more humid (read:hellish) climate.