Table 1.

Clinical definitions of PBB, CSLD, and bronchiectasis.

Condition	Clinical Definition
PBB	Isolated chronic wet or productive cough without signs of another cause which typically resolves following a 2–4 week course of appropriate oral antibiotics [2].
CSLD	Recurrent wet or productive cough episodes (≥3 per year), each lasting for >4 weeks, with or without other features (for example, exertional dyspnoea, symptoms of airway hyperresponiveness, recurrent chest infections, growth failure, clubbing, hyperinflation or chest wall deformity [3].
BE	Symptoms and/or signs outlined for CLSD as well as characteristic radiographic features on chest high-resolution computed tomography (such as bronchial lumen dilation and wall thickening) [3].