Fluke parasites are a type of parasitic flatworm or trematode that can cause infections and diseases of the digestive tract and lungs of its host species. The name “trematode” is Greek in origin, meaning, “having holes.” This refers to the external suckers that adult flukes use to leech nutrients from their hosts. Fluke parasites have fairly complex life cycles and must generally inhabit several hosts. Humans can contract a fluke parasite infection by consuming uncooked fish, plants, or animals or from contact with fluke-infected waters.