A 38-year-old man presented to the primary care clinic complaining of persistent fever, generalized pain, and fatigue. Five days earlier, he had been diagnosed with a flulike viral illness and instructed to increase fluids and take antipyretics as needed. He described the pain as deep in his bones and muscles and rated it a 9 on a 10-point scale. He also noted a severe headache confined to the frontal and retro-orbital area but reported no sinus congestion, cough, sore throat, or dysphagia. He did not complain of abdominal pain, nausea, vomiting, chills, diaphoresis, neck pain, photophobia, or rash. He had no significant past medical history and was taking no medications.