Welcome to Mayo Connect and the MAC/Bronchiectasis group. We have wide ranging discussions about this rather rare condition, and share a lot of information aimed at keeping ourselves healthy and off the hated Big 3 and other antibiotic therapy.

The good news is, you got me diving into MAC research again. I always seem to find something new. The bad news is, there is no research that shows nebbing a mixture of peroxide and water has a negative effect on mycobacteria on any of the authoritative sites with regard to Bronchiectasis or MAC/NTM (non-tubercular mycobacteria).
What you may be seeing is the benefit of hydration in thinning the mucus so you can cough it up better.

However, there is a treatment, which we have learned about from National Jewish Health (NJH) an epicenter for treatment of these conditions. Many of us have excellent results from nebulizing 7% saline solution. It does a number of things: moisturizers the lungs, thins mucus, helps induce coughing, and has been shown to inhibit the growth of NTM.

You can click on the magnifying glass above and search for 7% saline to find the discussions.

I have maintained off antibiotics for nearly 2 years by nabbing the high strength saline and doing airway clearance.

Sue