I was thinking that as well! I remember when I was first diagnosed and there was much discussion about treating with the big 3 even though I had no symptoms. I was told that there was a risk involved with not starting treatment although it was not clear what that was! I was almost ready to go down that road again recently. It would seem that my cold was a blessing in disguise as I would never have produced any samples for testing otherwise. I still have Bronchiectasis but it is such a load off my mind not to have MAC as well.