Giardia duodenalis (S. lamblia) Tarmflagellater (Giardiosis)
Kingdom: Protozoa | Subphylum: Mastigophora | Order: Diplomonadida | Family: Hexamitidae
Trophozoites (the pathogenic stage) of Giardia duodenalis (s. lamblia) in a smear of human intestinal contents. Identification is based on its morphological characters: Bilaterally symmetrical diplomonad of pyriform outline (10-18 x 5-10 μm) with broadly rounded anterior end containing two nuclei, and a pointed posterior end with two axostyles and a number of flagella.		Cysts of Giardia duodenalis (s. lamblia) in a faecal smear of human origin. Oval or spherical outline (8-14 x 6-10 μm) containing two or four nuclei and a comma-shaped chromatoid body.
Hosts: A wide range of vertebrates, incl. domestic mammals (cats, dogs, etc.).
Location: Small intestine of humans.