I'm a little late to the party but I got sick right before. Low grade fever, fatigue, a slight cough for a few days then the day we were heading out to CO, fever was gone. Once at altitude though, I could walk 30 yds then maybe 3 feet before I had to stop and spend significant time catching my breath. Two nights later my fever came back along with a cough. We decided to call the hunt. Which was wise because I spent 3 days essentially sleeping with a low grade fever. Didn't even eat. All good after that. I'm back to training for next year.