Giardiasis - Life Cycle: The life cycle of this parasite involves many steps: Infection occurs by the ingestion of cysts in contaminated water or food.
Giardia is a genus of anaerobic flagellated protozoan parasites of the phylum Metamonada in the supergroup "Excavata" (named for the excavated groove on one side of the cell body) that colonise and reproduce in the small intestines of several ...