Soru

A previously healthy $9$-month-old female infant presents to an urgent care center with a five-day history of persistent high temperatures, a harsh barking-like cough, and a severely runny nose. Her parents note that she has been rubbing her excessively red, tearing eyes. The family recently moved from a rural region in a developing country, and the infant has not received any childhood immunizations. On triage, her temperature is $39.7^\circ\text{C}$ ($103.5^\circ\text{F}$), pulse is $158\text{/min}$, and respirations are $48\text{/min}$. Pulse oximetry is $96\%$ on room air. Examination of the oropharynx reveals tiny white lesions on the inner cheeks that resemble grains of salt on a red background. Additionally, a non-pruritic, erythematous, maculopapular exanthem is visible starting at the forehead and extending downward to the neck and upper shoulders. Auscultation of the chest demonstrates coarse breath sounds bilaterally without wheezing. Which of the following is the most appropriate next step in management?