Question

An anxious mother brings her 11-month-old daughter to an outpatient clinic in mid-January, reporting that the infant has been struggling to breathe for the past 12 hours. The illness began three days ago with a runny nose and a low-grade fever. The mother notes that the child is now making a continuous whistling sound when she breathes out. The infant was born at term and her immunizations are up to date. The mother also mentions a secondary concern: she is worried her daughter is developmentally delayed because she can only cruise along furniture and is not yet walking independently without support. Vital signs include a temperature of $38.1^\circ\text{C}$ ($100.6^\circ\text{F}$), a pulse of $145/\text{min}$, respirations of $58/\text{min}$, and an oxygen saturation of $94\%$ on room air. Physical examination reveals an alert infant with clear nasal discharge. Chest auscultation reveals prolonged expiration with diffuse polyphonic wheezes and mild subcostal retractions. A rapid antigen detection test from a nasopharyngeal swab is positive for respiratory syncytial virus (RSV). Which of the following is the most appropriate next step in the management of this patient?