Giardia lamblia (Giardiasis). Infection occurs by ingestion of infective cysts, transmitted by food, water, feces, fomites, and flies. Excystation occurs in the small intestine, where the trophozoites multiply by binary fission, and cysts are passed in feces. Diagnosed by recovery/identification of trophozoites or cysts in feces or duodenal contents. Image from Pinterest, information from Medical Parasitology, A Self-Instructional Text.
"Obviously, we fancy-pants Global Northers would like to avoid parasitic infections, even by spooky-cute Giardia here. But, we'd also like to maintain a "primitive" lipid profile below about 150 or so. We can't do that by eating lots of fat and cholesterol, unless we're infected with Giardia or some other lipid-eating parasite. But we can do it by eating a whole-foods, plant-based diet."
Giardiasis is the most frequently diagnosed intestinal parasitic disease in the United States and among travelers with chronic diarrhea. Signs and symptoms may vary and can last for 1 to 2 weeks or longer. In some cases, people infected with Giardia have no symptoms.