A 3-year-old boy is brought to A&E with a barking cough, inspiratory stridor and hoarse voice. He is febrile but maintaining oxygen saturations at 96% on air and is not distressed at rest. What is the most appropriate first-line treatment?ANebulised Adrenaline and immediate intubationBOral dexamethasone as a single doseCHigh-dose oral antibioticsDImmediate lateral neck X-rayEHeliox via face maskCheck my answer