Dr. Joseph Falkinham is a research professor at Va. Tech whose main field of study is MAc/NTM mycobacteriums. He often speaks at the NTM conferences and advises National Jewish Health. He is very good at answering his e-mails, but I would read things he has written or watch a video of him speaking first before contacting him. That way, you are not asking redundant questions of him. I think this colonization question is a good one to ask him. Here is his e-mail address: jofiii@vt.edu