25th May 2025

A 45-year-old male developed a three-day history of watery diarrhoea 24 hours after returning from his trip to Bangladesh.

A 45-year-old male developed a three-day history of watery diarrhoea 24 hours after returning from his trip to Bangladesh. No blood was found in his stool. He has associated abdominal pain and nausea. Blood tests show a severe acute kidney injury with electrolyte disturbance. Stool PCR confirmed the presence of Vibrio cholerae as the underlying cause.

Which of the following structures has been affected to contribute to the pathogenesis of his diarrhoea?

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