A 1-year-old boy is brought to the urgent care clinic for fever, cough, and difficulty breathing. His mother tells you he had an upper respiratory tract infection 3-days ago. His temperature is 40.0°C (104°F). Auscultation of the lungs reveals expiratory wheezing and crackles on both sides. Physical examination shows suprasternal and subcostal retractions. A chest X-ray shows hyperinflation of the lungs and peribronchial thickening. Which of the following is the most likely diagnosis?AAcute bronchiolitis BAcute bronchitisCCroupDRespiratory syncytial virus

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