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    Giardia lamblia single-celled protozoan parasites in human duodenum, digital artwork. — Stock Photo
    Giardia lamblia single-celled protozoan parasites in human duodenum, digital artwork.
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Amoeba shell. Coloured scanning electron micrograph (SEM) of a shell from a Euglypha sp. amoeba. — Stock Photo
    Amoeba shell. Coloured scanning electron micrograph (SEM) of a shell from a Euglypha sp. amoeba.
    Conceptual image of plasmodium causing malaria — Stock Photo
    Conceptual image of plasmodium causing malaria
    Acrospaera radiolarian shell — Stock Photo
    Acrospaera radiolarian shell
    Plasmodium malariae protozoan inside red blood cells in the ring-form trophozoite stage, computer illustration — Stock Photo
    Plasmodium malariae protozoan inside red blood cells in the ring-form trophozoite stage, computer illustration
    Plasmodium ovale protozoan inside red blood cells in the stage of schizont, computer illustration — Stock Photo
    Plasmodium ovale protozoan inside red blood cells in the stage of schizont, computer illustration
    Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats. They are predatory organism, feeding on other ciliate protozoans, mainly Paramecium — Stock Photo
    Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats. They are predatory organism, feeding on other ciliate protozoans, mainly Paramecium
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration.
    Close-up of parasitic amoeba in human intestine, digital artwork. — Stock Photo
    Close-up of parasitic amoeba in human intestine, digital artwork.
    Conceptual image of plasmodium causing malaria — Stock Photo
    Conceptual image of plasmodium causing malaria
    Digital illustration of Acanthamoeba castellanii amoebas. — Stock Photo
    Digital illustration of Acanthamoeba castellanii amoebas.
    Hepatic bile duct infected with cocidian protozoa — Stock Photo
    Hepatic bile duct infected with cocidian protozoa
    Entamoeba histolytica engulfing red blood cells — Stock Photo
    Entamoeba histolytica engulfing red blood cells
    Plasmodium vivax protozoa and red blood cells, digital illustration. — Stock Photo
    Plasmodium vivax protozoa and red blood cells, digital illustration.
    Digital illustration of abstract pathogenic microorganisms. — Stock Photo
    Digital illustration of abstract pathogenic microorganisms.
    Paramecium ciliate protozoan — Stock Photo
    Paramecium ciliate protozoan
    Parasitic amoeba engulfing red blood cells — Stock Photo
    Parasitic amoeba engulfing red blood cells
    Protozoan Plasmodium malariae inside red blood cell in the schizont stage, computer illustration — Stock Photo
    Protozoan Plasmodium malariae inside red blood cell in the schizont stage, computer illustration
    Plasmodium vivax protozoa and red blood cells, digital illustration. — Stock Photo
    Plasmodium vivax protozoa and red blood cells, digital illustration.
    Babesia parasites inside red blood cell, computer illustration — Stock Photo
    Babesia parasites inside red blood cell, computer illustration
    Lychnocanoma radiolarian shell — Stock Photo
    Lychnocanoma radiolarian shell
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration.
    Protozoan Plasmodium malariae inside red blood cell in the schizont stage, computer illustration — Stock Photo
    Protozoan Plasmodium malariae inside red blood cell in the schizont stage, computer illustration
    3d illustration of transparent and colourful protozoa. — Stock Photo
    3d illustration of transparent and colourful protozoa.
    Freshwater sponge (Spongilla sp.), coloured scanning electron micrograph (SEM). — Stock Photo
    Freshwater sponge (Spongilla sp.), coloured scanning electron micrograph (SEM).
    Giardia lamblia flagellated protozoan parasite, digital illustration. — Stock Photo
    Giardia lamblia flagellated protozoan parasite, digital illustration.
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration.
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Digital illustration of ciliate protozoan Balantidium coli intestinal parasites causing ulcer in intestinal tract. — Stock Photo
    Digital illustration of ciliate protozoan Balantidium coli intestinal parasites causing ulcer in intestinal tract.
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration.
    Babesia parasites inside red blood cell, computer illustration — Stock Photo
    Babesia parasites inside red blood cell, computer illustration
    Plasmodium ovale protozoan inside red blood cells at the ring-form trophozoite stage, computer illustration — Stock Photo
    Plasmodium ovale protozoan inside red blood cells at the ring-form trophozoite stage, computer illustration
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Babesia parasites inside red blood cell, computer illustration — Stock Photo
    Babesia parasites inside red blood cell, computer illustration
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Acanthamoeba castellanii amoeba in cerebrospinal fluid, digital illustration. — Stock Photo
    Acanthamoeba castellanii amoeba in cerebrospinal fluid, digital illustration.
    Plasmodium vivax protozoa and red blood cells, digital illustration. — Stock Photo
    Plasmodium vivax protozoa and red blood cells, digital illustration.
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration.
    Digital illustration of ciliate protozoan Balantidium coli intestinal parasites causing ulcer in intestinal tract. — Stock Photo
    Digital illustration of ciliate protozoan Balantidium coli intestinal parasites causing ulcer in intestinal tract.
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Digital illustration of abstract pathogenic microorganisms. — Stock Photo
    Digital illustration of abstract pathogenic microorganisms.
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Babesia parasites inside red blood cell, computer illustration — Stock Photo
    Babesia parasites inside red blood cell, computer illustration
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract. — Stock Photo
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract.
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Cell with pseudopodia — Stock Photo
    Cell with pseudopodia
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration.
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Plasmodium malariae protozoan inside red blood cells in the ring-form trophozoite stage, computer illustration — Stock Photo
    Plasmodium malariae protozoan inside red blood cells in the ring-form trophozoite stage, computer illustration
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Sporozoite malaria pathogens, digital illustration. — Stock Photo
    Sporozoite malaria pathogens, digital illustration.
    Babesia parasites inside red blood cell, computer illustration — Stock Photo
    Babesia parasites inside red blood cell, computer illustration
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Plasmodium falciparum protozoan inside red blood cells, computer illustration — Stock Photo
    Plasmodium falciparum protozoan inside red blood cells, computer illustration
    Acanthocystis. Coloured scanning electron micrograph (SEM) of a centrohelid heliozoan with tangential plate-scales and radial spines — Stock Photo
    Acanthocystis. Coloured scanning electron micrograph (SEM) of a centrohelid heliozoan with tangential plate-scales and radial spines
    Protozoan Plasmodium malariae inside red blood cell in the schizont stage, computer illustration — Stock Photo
    Protozoan Plasmodium malariae inside red blood cell in the schizont stage, computer illustration
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration