Infectious diseases:
(1) Pseudomonas species
(2) Hemophilus influenzae
(3) Aspergillus species
(4) adenovirus
(5) measles virus
(6) influenza virus
(7) HIV
(8) Mycobacterial species (M. tuberculosis, M. avium-intracellulare)
Autoimmune disorders:
(1) rheumatoid arthritis (RA)
(2) systemic lupus erythematosus (SLE)
(3) Sjogren's syndrome
(4) relapsing polychronditis
(5) ulcerative colitis
(6) Crohn's disease
Hereditary disorders:
(1) cystic fibrosis
(2) yellow nail syndrome
(3) primary ciliary dyskinesia
(4) alpha-1 antitrypsin deficiency (AAT)
(5) Mounier-Kuhn syndrome (tracheobronchomegaly)
(6) William-Campbell syndrome (cartilage deficiency)
(7) pulmonary sequestration
(8) Marfan's syndrome
(9) primary hypogammaglobulinemia
Toxic inhalations:
(1) chlorine gas
Secondary causes
(1) recurrent aspiration (heroin overdose, etc)
(2) foreign body aspiration
(3) secondary ciliary dyskinesias (Young's syndrome)
(4) secondary hypogammaglobulinemia (CLL, other)
(5) secondary immunodeficiency (organ transplant, etc)
