A 38-year-old woman from Delhi presents to the emergency department with a 3-day history of high fever (39.8°C), severe myalgia, headache, and dry cough. She reports that her 12-year-old son had similar symptoms 5 days ago. On examination, she is febrile but alert, with clear lungs and no focal findings. A rapid antigen test for influenza A is positive. She has no significant past medical history and is not on any medications. Which of the following is the most appropriate next step in management?