Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Bronchiectasis ?
    ### Response:
    Damage to the walls of the airways usually is the cause of bronchiectasis. A lung infection may cause this damage. Examples of lung infections that can lead to bronchiectasis include:
                
Severe pneumonia (nu-MO-ne-ah)
                
Whooping cough or measles (uncommon in the United States due to vaccination)

    