African trypanosomiasis
A number of protozoan pathogens are human parasites, causing diseases such as malaria (by "Plasmodium"), amoebiasis, giardiasis, toxoplasmosis, cryptosporidiosis, trichomoniasis, Chagas disease, leishmaniasis, African trypanosomiasis (sleeping sickness), "Acanthamoeba" keratitis, and primary amoebic meningoencephalitis (naegleriasis).