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Bronchiolitis — RACP Paediatrics MCQ

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EasyRespiratoryBronchiolitisRACP Paediatrics

A 6-month-old infant presents in winter with 2 days of coryzal symptoms followed by increasing work of breathing and poor feeding. On examination there is widespread fine inspiratory crackles and subcostal recession. Oxygen saturation is 91% in room air. What is the most likely diagnosis?

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Correct answer: A — Bronchiolitis

This is a classic presentation of bronchiolitis: an infant <12 months with a viral prodrome followed by respiratory distress with fine crackles. RSV is the most common cause. Per the Australasian Bronchiolitis Guideline (2025 update), management is supportive with no role for bronchodilators or corticosteroids.

Reference: PREDICT Network – 2025 – Australasian Bronchiolitis Guideline 2025 Update