SERPINA1 and hyperinsulinemic hypoglycemia, familial, 4: Airway infections (protracted/recurrent/persistent): Protracted bacterial bronchitis, chronic suppurative lung disease, bronchiectasis, cystic fibrosis, immune deficiency/ciliary dyskinesia, alpha-1 antitrypsin deficiency, other chronic infections e.g., tuberculosis and atypical mycobacteria