Bronchiectasis describes a permanent dilatation of the airways secondary to chronic infection or inflammation. After assessing for treatable causes (e.g. immune deficiency) management is as follows:
Most common organisms isolated from patients with bronchiectasis:

3D illustration showing the typical changes found in bronchiectasis
Imaging

Chest x-ray showing tramlines, most prominent in the left lower zone

CT chest showing widespread tram-track and signet ring signs