A 45 year old man presents with a 12 week history of recurrent cough and purulent sputum. A subsequent high-resolution CT demonstrates features of Bronchiectasis. Which one of the following is most likely to be the cause of his condition?
A 45 year old man presents with a 12 week history of recurrent cough and purulent sputum. A subsequent high-resolution CT demonstrates features of Bronchiectasis. Which one of the following is most likely to be the cause of his condition?
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