I hope I am MAC free. Sputum tests are not that reliable for MAC which is all I have had. I do have chronic Pseudomonas A. which if you ask me is as bad or worse! But I keep doing all I can to deal with it and to prevent MAC. You are fortunate to get all this information early on. I did not do anything much about my Bronchiectasis for many years other than cough up the mucus once a day with self learned breathing techniques. I only started with the nebulizing etc. etc. a few years ago. Do all you can to keep your airways clear. As my pulmonologist said "your airway secretions do not work normally with Bronchiectasis so you have to do other things to stay ahead of the mucus. And even then your clearance will not be as good as normal secretions". We really have to live differently than other people and avoid getting the flu or exacerbations to prevent further airway damage.