In Nov. 2015, I began 3-antibiotics, 3-days per week. Every Friday (the third day of meds) I suffered many bathroom poops. I complained & doc changed one of the antibiotics. I feel better other than common symptoms associated with MAC. I am 67, tall and slim. Eighteen months medicine is a long, long time with no guarantee. Doc said he thought I got it at my fitness club. (shower head, whirlpool). They say online it's from municipal water. Health Canada doesn't know the cause. Comments?