I guess with each individual the scenario of the sputum is different. I was just curious ...like if a dr did a bronchoscopy on a healthy patient..would he see thick sputum in there? There's a lot I don't understand about Mac/Bx.....and although I ask questions here and to my dr, there is still a mystery to a lot of it...including the antibiotics.........I wish I had never gotten this...I wish none of us ever got it....dam it all.