Giardia
Genus of flagellate intestinal eukaryotes parasitic in various vertebrates
Giardia
Giardia ( or ) is a genus of zoonotic anaerobic flagellated protozoan parasites of the phylum Metamonada that colonise and reproduce in the small intestines of several vertebrates including humans, causing the disease giardiasis. Their life cycle alternates between a binucleated motile trophozoite and an infective, metabolically inert, environmentally resistant tetranucleate cyst. Cysts are transmitted between hosts through the fecal–oral route, contaminated water and/or food. Giardia were first seen by the Dutch microscopist Antonie van Leeuwenhoek in 1681 under the light microscope. The genus is named after French zoologist Alfred Mathieu Giard.
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