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spp., the protozoan parasite which causes malaria. The six species infective to humans are P. falciparum, P. malariae, P. vivax, P. ovale wallikeri, P. ovale curtisi, and P. knowlesi.
* Leishmania, unicellular organisms which cause leishmaniasis
* Entamoeba and Giardia, which cause intestinal infections (dysentery and diarrhoea)
* Multicellular organisms

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