To the best of my recollection, when I was at Mayo's 2 years ago I gave sputum samples on three different days. It seems to me they knew immediately that there was a showing of MAC but decided to not treat it because it was not much. Now, since I've been home and using a more local lab, my primary care physician has usually requested the analysis and I take the sample to the lab. Have done this about 8 times over the last two years....... it has shown MRSA, MSSA, pseudomonas, etc., and there would be a listing of antibiotics recommended for whatever was there. I have hard copies of all. I always ask for that. But, the last four times the report has said negative and therefore there has been no recommended antibiotic. Dr. Moua (Mayo's) has just told me to use clindamycin as that has always worked well. When I've inquired of the lab about MAC they tell me there has been nothing to culture and I've never had a culture report from the local lab. I'm doing pretty well...... but I've read it takes 6-8 weeks to culture for Mac, and therefore, just wonder if they are getting it right. I have questioned why I seem to have a flare of coughing and no bacteria (for four times) ....... then I take antibiotics for a couple of weeks and am clear for about a month. It's just not all understandable to me. but certainly I'm not ill like I was when I got to Mayo's two years ago after five years of horrid coughing and green phlegm and 7 local doctors saying I had asthma (which I knew was not right). Mayo's is 10 hours from here so I'll go back if I become ill again but I've done okay with whatever program I'm on presently. Could change tomorrow....... but that is my story as of now. The coughing used to be so bad I sat up in bed for years to try to sleep at all. I was never able to go to any public function because I would steal the show. So...... one thing I found relieved that cough just for a few hours at night was a hydrocodone. I came upon that by accident. It was given to me for an injury and I found that it suppressed the cough for about 4 hours -- enough that I could get a little bit of sleep. Just passing this on in case there is someone who has not been able to get any rest at all. Worth a try. I didn't take it in the daytime because I certainly didn't want to become addicted but at night, it was the only relief I ever found ----- until I got to Mayo's.