Hello Don. I first discovered 7% saline as a treatment back in 2010 when I was researching lung diseases. The French had been using it successfully as a treatment. I had asked my doctors along the way about it, and they all said "Never heard of it". Finally, when I asked my Mayo doctor about it, he said yes, absolutely lets try that. That was in 2013. By 2014, I tested negative for mac and have ever since. I do not know if it was the saline that pushed that negative result or the antibiotics, or both. I went off of all antibiotics last Spring and now only do the albuterol and saline. My last sputem test from June came back negative. I think that my isolating from covid has also been protecting me from picking up extra germs. I will continue to nebulize the saline indefinitely as I think it is good for my lungs.