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Bronchiolitis — USMLE Step 3 MCQ

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EasyPediatrics (well-child, chronic management)BronchiolitisUSMLE Step 3

A 5-month-old infant has rhinorrhea, cough, wheezing, and mild retractions in winter. Oxygen saturation is 96% on room air. He feeds adequately and has diffuse crackles and wheezes. Which of the following is the most likely diagnosis?

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Correct answer: D — Bronchiolitis

Viral upper respiratory symptoms followed by wheezing and crackles in an infant during winter is consistent with bronchiolitis.

Reference: American Academy of Pediatrics clinical practice guidance and Bright Futures preventive care