3rd August 2023

A 26-year-old Engineer returns from Sri Lanka and complains of a 4-week history of flatulence, malabsorption, and explosive diarrhoea.

A 26-year-old Engineer returns from Sri Lanka and complains of a 4-week history of flatulence, malabsorption, and explosive diarrhoea. Stools are non-bloody. His trousers are now too large for him. He has no previous medical history of note.

A flagellated protozoa is observed on second stool microscopy.

What is the underlying diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.