The way I was diagnosed was by having a bronchoscopy. I had no tissue damage and no cavities in my lungs. They also did not find any bacteria in my lung when doing this procedure. They did biopsy a nodular in my lung that then grew the bacteria. That is the only way they found it. I thought after the test I was clear but after about two weeks the Doctor called me with the news. Just so you know sometimes very hard to diagnose. I was also told not to use a humidifier or anything with water . I do have air purifiers throughout the house now with Hepa filters. I had a chest X-ray in 2016 which showed nothing wrong. Then in August of 2021 it showed bronchietasis and mild lung scarring. Doctor said the bacteria could have gotten in my lung years ago.So will never know which is frustrating. Thought I was so healthy and did everything right so something like this wouldn’t happen. I wish you the best of luck.