Less than 10 cysts when given orally. Cysts are shed during the entire period of infection. Humans, wild and domestic animals. Beaver considered zoonotic reservoir for water-borne infection in headwaters of many cold water streams. Sensitive to quinacrine hydrochloride, metronidazole and furazolidone.
Cysts remains infectious for prolonged periods in the environment.
Administer appropriate drug therapy, usually Metronidazole. Two cases were reported up to 1987. Feces, duodenal secretions. Biosafety level 2 practices and containment facilities are recommended for activities with infective stages of mammalian Giardia spp. In sealed containers that are appropriately labeled.