I spent the past two weeks in Puerto Rico for work. As happened last year, I got an upper respiratory infection, again. I have a few ideas for why it always happens. The air is extremely dry due to air conditioners constantly running (work and hotels). Normally humidifying the room helps, which I forgot to do. This time, I started the trip slightly sick. And, feeling ok half way through, I stopped taking meds. Had I done those two things correctly, I may be feeling much better. Hard to say, as I was working 14 hour days.
Lesson learned, I suppose.