He had been well until nine days earlier, when dry cough, myalgias, fever (39.4°C), malaise, sore throat and nasal congestion presented. On physical examination in the Emergency Room (ER), the patient had a temperature of 39.2°C, a heart rate of 50 beats per minute and a respiratory rate of 35 breaths per minute. A buccal swab was negative for influenza A and B antigens, and no parasites were seen on a peripheral-blood smear.