The resident admits a 2-month-old boy who has had labored breathing, fever to 100.8°F, and upper respiratory symptoms for the prior 3 days. He was seen in the emergency department and received treatments with albuterol and prednisolone without relief. The boy has no known allergies, and his immunizations are up to date. He has not had any vomiting and has been voiding well. The neurologic, integumentary, cardiovascular, and respiratory reviews of systems results are negative. Infant was full term, born vaginally with no maternal complications. The boy lives with nonsmoking parents and has one sibling. Physical examination: Pulse, 114 beats per minute; temperature, 100°F; oxygen saturation on oxygen, 96%; weight, 9 lb 4 oz; head, eyes, ears, nose, throat and mouth, nodes, cardiovascular, abdomen, extremities, skin, andneurologic examinations, normal; lungs, rhonchi and wheezes bilaterally, subcostal retractions.

Assessment: Chest radiograph shows hyperaeration and peribronchial thickening; respiratory syncytial virus (RSV) antigen test...

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