Chang CL, Chen LC, Yu CJ, et al. - Researchers investigated characteristics of the Mycobacterium avium–intracellulare complex pulmonary disease (MAC-PD) caused by distinct subspecies. From 2013–2015, they identified 144 patients with Mycobacterium avium pulmonary disease in three hospitals in Taiwan. Among these, 57 (39.6%), 37 (25.7%), 37 (25.7%), and 13 (9.0%) were infected with Mycobacterium intracellulare subspecies intracellulare (MIsI), M. avium subspecies hominissuis (MAsH), M. intracellulare subspecies chimaera (MIsC), and others, respectively. During the 2-year follow-up, spontaneous culture-negative conversion occurred in 22 (15.3%) patients while 15 (10.4%) exhibited radiographic progression. Patients with MAsH-pulmonary disease were characterized by younger age, a higher human immunodeficiency virus infection rate and a higher radiographic progression rate. The susceptibility rates to clarithromycin and inhaled amikacin were both 98.6% among all MAC species, and the lowest rate of resistance to moxifloxacin was observed for MAsH .