Hi Don, I am really going out on a limb and have stopped the nebs and just do dry salt inhaler. I have cavitary MAC and it isn't getting better. The last time I had MAC I was not told about nebs. This time, I was told to nebs twice a day and low and behold the cavity showed up and got bigger. Anyway, I go to Mayo next week and will see what they have to say about surgery. I guess the burning question is, does the nebs really help? or does it not help when there is a big hole in my lung that festers the bugs? Only time will tell..... good luck to us all. Carolyn