An 8-Month-Old Boy Is Brought to the Hospital for Progressive

An 8-month-old boy is brought to the hospital for progressive dyspnea and fever. He has no medical diseases and takes no medications. He lives with his parent and 2 siblings. His father smokes 2 packest of cigarettes. Temperature is 38.5 C (101.3 F) and respirations are 36/min.  Pulse oximetry is 96% on room air.  Chest auscultation reveals mild subcostal retractions and focal crackles in the left lower lobe.  Which of the following underlying factors is most likely contributing to this patient's current condition?

A) Decreased presence of lung monocytes
B) Exaggerated airway reactivity
C) Impaired mucociliary function
D) Inhibited B cell maturation
E) Reduced alveolar surface area

Correct Answer:

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