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EasyPaediatricsBronchiolitisau-amcau-racgp

A 3-year-old boy is brought to the emergency department with a 2-day history of cough, rhinorrhoea and increasing work of breathing. He has subcostal retractions and widespread crackles and wheeze. Oxygen saturation is 93% on room air. He has no previous history of wheeze or asthma. What is the most likely diagnosis?

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