Review Question - QID 210085

A 5-year-old girl is brought to the emergency department with a 6-day history of fevers and irritability. The fevers have ranged from 101-104°F (38.3-40°C) and are unresponsive to ibuprofen. She developed a rash 3 days ago and has refused to wear shoes because they feel “tight.” Other than 2 ear infections she had when she was younger, the patient has been healthy. She is up-to-date on her vaccinations except for the vaccine boosters scheduled for ages 4-6. Her temperature is 103.5°F (39.7°C), blood pressure is 110/67 mmHg, pulse is 115/min, and respirations are 19/min with an oxygen saturation of 98% O2 on room air. Physical examination shows bilateral conjunctivitis, palpable cervical lymph nodes, a diffuse morbilliform rash, and desquamation of the palms and soles with swollen hands and feet. Which of the following is the most appropriate next step in management?