Protozoa examples include malaria, leishmaniasis, Chagas disease, and African sleeping sickness.

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Protozoa are single-celled eukaryotic parasites. Malaria, leishmaniasis, Chagas disease, and African sleeping sickness are caused by protozoan species (Plasmodium, Leishmania, Trypanosoma cruzi, and Trypanosoma brucei, respectively). These organisms are transmitted by insect vectors and reproduce as parasites within the human host. This distinguishes them from viruses (which are noncellular) and from bacteria or rickettsia (which are prokaryotic). So the organisms responsible for these diseases are protozoa.