@ling "I don't understand why we get this fungus. It doesn't seem that a lot of people have it. Maybe there is something besides bronchiectasis that makes us vulnerable to."

Vulnerability -- absolutely. First, having bronchiectasis. Add asthma and its treatment (usually inhaled steroids) makes us even more susceptible to picking up stuff as steroids suppress the immune system. Untreated asthma can make bronchiectasis worse, however, which might result in progressing bronchiectasis. Find minimum effective dose, which is a fine line to manage.