A 3-year-old presents with 5 days of fever, irritability, cr…
A 3-year-old presents with 5 days of fever, irritability, cracked lips, bilateral nonpurulent conjunctivitis, and swelling of the hands and feet. He has a diffuse maculopapular rash and a tender unilateral cervical lymph node. Labs show mild anemia, elevated ESR and CRP, and normal platelet count. UA shows sterile pyuria. Which of the following is the most appropriate next step in management?