Shirai T, Furuuchi K, Fujiwara K, et al. - Researchers examined how results of Aspergillus precipitating antibody (APAb) test, a serodiagnostic test for pulmonary aspergillosis (PA), are associated with the clinical outcomes of patients with Mycobacterium avium complex lung disease (MAC-LD). Between 2007 and 2014, 131 patients who were newly diagnosed as having MAC-LD were checked for APAb at the time of diagnosis in this retrospective analysis. Among these patients, APAb test results were positive at the diagnosis of MAC-LD in 20 (15.3%) patients. More frequent reporting of underlying lung disease and more frequent development of PA was observed among APAb-positive patients with MAC-LD. APAb positivity was identified to be an independent negative prognostic factor in MAC-LD patients.