A 45-year-old man presents with a low grade intermittent fever for 4 weeks, along with night sweats, loss of appetite, and a weight loss of 3 kg during the same time period. He also experienced a mild productive cough, mostly during the day. He denies exposure to gasses, fumes, or toxic chemicals and is not on any medications, including over-the-counter drugs or supplements. He denies unsafe sexual encounters and has no history of blood transfusions. His medical and surgical histories are unremarkable. His family history is unremarkable.