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Parasite: a parasite is an organism that lives in or on another organism and draws its nourishment from it (from the Greek "para-sitos": beside food). Strictly speaking, it has no connotation of harmfulness or otherwise. Usually, however, the meaning is taken in a narrower sense and the term is used to refer to various worms, protozoa and arthropods which have another organism as their habitat. Parasites often have a complicated life-cycle with well-defined hosts and a specific mode of transmission.

ProtozoaProtista: unicellular organisms that contain a cell nucleus surrounded by a nuclear membrane: eukaryotes (as opposed to prokaryotes - bacteria). There are specific treatments for each disease. e.g. Sleeping sickness, malaria, amoebiasis, leishmaniasis, giardiasis, toxoplasmosis.