USMLE Step 3 Question of the day

An 8-year-old boy is brought to the office because of a 5-day history of fever, coryza and cough that coincides with an epidemic of influenza in the community. Today he is unable to walk because of pain in the calves. His mother has been giving him acetaminophen for fever and pain. Physical examination shows a temperature of 38.3°C (101.0°F). He is alert, interactive and well-hydrated. He has clear rhinorrhea, mild pharyngeal erythema and a clear chest. His calves are tender to palpation. Strength cannot be tested because of pain. Neurologic examination, including deep tendon reflexes, is normal. Which of the following is the most appropriate therapy? A) Acetaminophen, orally, as needed B) Amantadine, orally C) Immune globulin, intravenously D) Influenza virus vaccine, intramuscularly E) Prednisone, orally