Clofazimine has been used as a salvage medication in NTM-pulmonary disease for many years. Yet no data are available on its effectivity. Jakko van Ingen has started to collect retrospective data on patients that have received Clofazimine for NTM-PD. The NTM-NET invites everybody who has used Clofazimine ín NTM-PD to collaborate in this retrospective study. For further informations, please contact Jakko van Ingen