Photo by: Serj Siz`kov. Protozoans are a group of eukaryotic single-celled organisms. Several species of protozoans infect humans and inhabit the body as commensals or parasites. The parasitic protozoans of major medical importance include certain species of amoebae, flagellates, and sporozoans.everal species of protozoans infect humans and inhabit the body as commensals or parasites. The parasitic protozoans of major medical importance include certain species of amoebae, flagellates, and sporozoans.
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