Thank you, Kristi, for your feedback. I didn't have a cough either ... in the very beginning. A calcium score prescribed by my cardio doctor indicated infiltrates in my lungs. So, no symptoms, but these infiltrates. Another year passed before I had a definite diagnosis of MAC and began the antibiotics. By then I was chirping more than coughing. Now I'm coughing, on and off during the day but mostly when I wake up in the morning. Coughing and sometimes losing my breath. I'm reading here for the first time about airway cleansing. I don't know what that involves. Do you?