History A 24-year-old man presented to his general practitioner (GP) with a fever. The fever has been present on and off for three days. On the first day, he felt a little shaky, but by the third day, he felt very unwell with a fever and an intense cold with generalized shaking at the same time. He felt very sweaty. The whole episode lasted for 2.5 hours, and he felt drained and unwell afterward. He had lost his appetite. There is a previous history of hepatitis 4 years earlier, and he had a glandular fever at the age of 18 years.
He smokes 15–20 cigarettes each day and occasionally smokes marijuana. He denies any intravenous drug abuse. He drinks around 14 units of alcohol each week. He has taken no other medication except for malaria prophylaxis. He denies any homosexual contact. He has had several heterosexual contacts each year but says that all had been with protected intercourse.…
