CD79A and bronchiectasis: The serum antiglycopeptidolipid core IgA antibody test showed excellent accuracy in identifying patients with NTM-PD in a large cohort with bronchiectasis and also showed excellent discrimination between patients with NTM-PD and those with NTM isolation who did not meet the joint American Thoracic Society and Infectious Diseases Society of America diagnostic criteria for NTM-PD.