A hiker drinks fresh water from a stream in a forest. Two days later he experiences violent diarrhoea and examines a sample of his own stool. Under the microscope he observes an organism approximately 15µm long with what appears to be two nuclei. The hiker's diarrhoea is most likely caused by

Question

Quizplus · Accepted Answer

Giardia, a protozoan parasite, is known for causing diarrhoea and can be identified by its characteristic appearance, including its size and the presence of two nuclei, fitting the description given.

A Hiker Drinks Fresh Water from a Stream in a Forest