Acute laryngo-tracheo-bronchitis (croup): common viral illness, most frequently occurring aged <4Y

DD: acute epiglottis: life-threatening condition, caused H. influenzae usually in children aged 2–6Y. Acute, high fever, dysphagia, drooling, and forward-sitting posture

Bronchiolitis: mainly aged<18M, infection of the bronchioles, usually RSV

Dexamethasone (0.15 mg/kg), PO, STAT

Croup (CKS), Croup (NHS Choices), Croup (patient.info), Glucocorticoids for croup (Cochrane review, 2011)