Giardia lamblia

Giardia lamblia is a protozoan parasite that causes the diarrheal disease giardiasis. It classically affects campers and hikers after contaminated water, causing symptoms like bloating, foul-smelling diarrhea, and flatulence. It is treated with antibiotics, and its prevention includes good hygiene practices and prompt treatment of water supplies that may be contaminated with Giardia.