A hunter was camping with his dog near a mountain spring where beavers were building a dam, and many animals came to drink. After a month, he developed severe watery diarrhea, abdominal pain, bloating, vomiting, and low-grade fever. His stool had a "rotten-egg" smell of hydrogen sulfide. What is the most likely parasite causing this patient's condition, and how is diagnosis confirmed?
What will be an ideal response?
This person is most likely suffering from giardiasis. Infection usually results from ingesting cysts in contaminated drinking water. Even if humans avoid drinking contaminated water, they usually do not prevent their dogs from drinking it. Therefore, it is usually just a matter of time before the dog passes the protozoa to its owner. Diagnosis is confirmed by the presence of flat, pear-shaped trophozoites seen in the stool under microscopic examination or by xTAG GPP test.
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