@nlee1954 It's called Phage Therapy. All I know is that Companies are creating phage banks. The virus or phage would be specific to the exact genetic makeup of the NTM strain. Sounds like there's a lot of NTM variance if a "bank" of these phages need to be collected and stored. I did listen to a youtube presentation and the founder of one of the phage banks spoke about looking in the environment for these natural occurring phages.