Q. A four-year-old girl is brought to the emergency department by her mother for fever and mouth ulcers for the past 4 days. The mother says that her symptoms initially started with a high-grade fever and poor appetite. But since yesterday the child has been complaining of severe pain in her mouth and is not able to eat or drink due to mouth ulcers. She does not have similar complaints in the past and has no known drug allergies. No similar history in the family. The child is attending the daycare center for the past 1 year. Her temperature is 102°F (38.8°C), pulse is 102/min, blood pressure is 80/62 mmHg, and respirations are 15/min. On physical examination, the child looks irritable and weak. On intraoral examination, gums are inflamed and fiery red colored with multiple vesicles on the attached mucosa. Multiple vesicles and ulcers are also seen along the sides of the tongue and buccal mucosa. Some of these ulcers are bleeding and coalesced together, thereby giving a geographic map-like configuration. Laboratory investigations are shown below. What is the best next step in her management?