@mirsy I agree with others comments. If your husband has not been evaluated for infection, then this would be top of my list. As someone with NTM, I would always suggest that if an antibiotic is prescribed for a patient with BE, if possible, it not be azithromycin, as NTM is very difficult to treat without azithromycin and as Scoop points out, one can develop a resistance to azithromycin over time. I know some doctors treat BE with low dose azithromycin, but to me, and many NTM experts, it is risky to do so as no one knows who with BE may be susceptible to an NTM infection and having BE is itself a risk factor for developing an NTM infection.