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A 9-year-old boy is brought to the physician by his mother because of a few-day ...
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A 9-year-old boy is brought to the physician by his mother because of a few-day history of fever and cough. He has had similar episodes of inflammation of the respiratory tract with fever, cough, and runny nose with the presence of thick, colored mucus in the past. The most likely cause of recurrent infections in this patient is a dysfunction of which of the following cell types?
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