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Review Question - QID 211039

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QID 211039 (Type "211039" in App Search)
A 5-year-old boy is brought to the emergency room by his parents due to worsening cough, fever, and difficulty breathing in the past 2 days. Physical exam reveals a barking cough and use of accessory muscles for breathing. After a full clinical workup, he is diagnosed with an upper respiratory infection caused by a parainfluenza virus. Which of the following findings in the clinical workup of this patient supported the diagnosis?