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A 3-year-old boy presents in severe respiratory distress. His mother informs you that he has been ill for the last 5 days, initially with a low-grade fever and “barky cough.” He was seen at an urgent care facility 4 days ago and given a “breathing treatment” and discharged on steroids. He has become progressively worse despite compliance with the steroid regimen, which prompted his mother to call an ambulance this morning. He is otherwise healthy and up-to-date on his immunizations. On examination, the child is toxic in appearance and febrile. His oropharynx is clear. You hear both inspiratory and expiratory stridor. What is the most likely diagnosis?ABacterial tracheitisBCroupCEpiglottitisDPeritonsillar abscess30-month-old boy presents with respiratory distress. He was diagnosed with croup 1 week ago and received a single dose of dexamethasone. His cough had nearly resolved until yesterday, when coughing worsened, and he developed nasal congestion. This evening, he developed inspiratory stridor, increased work of breathing, and a fever of 103°F (39.4°C). What is the most likely diagnosis?

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