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Melissa, a 12-year-old girl with cystic fibrosis comes to the primary care office with complaints of increased cough and productive green sputum over the last week

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Melissa, a 12-year-old girl with cystic fibrosis comes to the primary care office with complaints of increased cough and productive green sputum over the last week. She also complains of increasing shortness of breath. She denies sore throat or nasal congestion. On physical examination her temperature is 101 and she has inspiratory wheezes bilaterally. Negative lymphadenopathy noted. Posterior pharynx is pink without exudate. BP 112/72 HR 96 RR 28.

1. In cystic fibrosis, the airway microenvironment favors bacterial colonization. In a minimum of 150 words explain the pathophysiological reason for this occurrence.