@alleycatkate Thanks for sharing the information. I wasn't aware of the MAC natural conversion. But my case may just fit the bill. When I was initially diagnosed with MAC and bronchiectasis, I had just coughed up huge amounts of blood out of the blue. I had been very healthy up till then and there was no indication that this would happen to me, except that I was chronically coughing up sticky mucus. The latter was determined to be the result of bronchiectasis, which is incurable but not life-threatening. After I came out of ER, I stopped coughing up blood and have not done so for almost 5 years. My health has been good. I eat well and am active physically. For that reason, I didn't see any reason to go on a drug treatment out of the same concern as others that they might do more harm than good to my body. My pulmonologist agreed with me. I have been very happy with my decision because I continue to be healthy and active with no indication of MAC worsening. I figure as long as I'm able to live a normal life, I can do without the drugs.