A 50-year-old male presents with malaise, weight loss and
diarrhoea. On examination his skin is pigmented, he has clubbing, anaemia and
gastrointestinal endoscopy is performed and distal duodenal biopsies
demonstrate stunted villi. The lamina propria is distended with multiple
periodic acid-Schiff (PAS) positive macrophages.
The aetiological agent in this condition is:
Mycobacterium avium intracellulare
Epstein Barr virus