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A 12-month-old boy presents with a hoarse, harsh cough and inspiratory stridor following two days of mild cough and nasal congestion. He is in mild respiratory distress. Lungs are clear to auscultation. What is the most likely diagnosis?An 18-month-old boy presents to the emergency department with two days of cough, low-grade fevers, and congestion. Today the cough has become hoarse and barking. What is the most likely diagnosis?An 18-month-old boy is brought in by his parents for shortness of breath. The parents woke to him coughing a low-pitched cough. They also noted other noises when he was breathing in that resolved upon walking outside. The patient is frequently coughing but has no abnormal sounds on auscultation of the neck or lungs. What is the most appropriate treatment?AAlbuterolBDexamethasoneCRacemic epinephrineDRibavirin

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