A 45 year old man presents with a low grade, intermittent fever for 4 weeks, associated with night sweats, loss of appetite and weight loss of 3 kg.
He also experienced a mild productive cough, mostly during the day.
He denies exposure to gases, fumes or toxic chemicals and is not on any drugs. He denies unsafe sexual encounters and has no history of blood transfusions.
He is from a low socioeconomic background. .