A fully immunized 2-year-old boy presents to the emergency room with several days of low-grade fever，barking cough，and noisy breathing. Over the last few hours he has developed a fever of 40℃ and looks toxic. He has inspiratory and expiratory stridor. The family has not noticed drooling，and he seems to be drinking without pain. Direct laryngoscopy reveals a normal epiglottis. The management of this disease process includes which of the following?

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