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    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration. — Stock Photo
    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration.
    Balamuthia mandrillaris amoeba, computer illustration — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration
    Protozoan Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration. — Stock Photo
    Protozoan Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration.
    Plasmodium ovale protozoan, digital illustration. — Stock Photo
    Plasmodium ovale protozoan, digital illustration.
    Pentatrichomonas hominis protozoan in human large intestine, digital illustration. — Stock Photo
    Pentatrichomonas hominis protozoan in human large intestine, digital illustration.
    Flush toilet microbe on contaminated surface, conceptual digital illustration on white background. — Stock Photo
    Flush toilet microbe on contaminated surface, conceptual digital illustration on white background.
    Giardia lamblia protozoan parasites, digital illustration — Stock Photo
    Giardia lamblia protozoan parasites, digital illustration
    Digital illustration of trypanosome parasite which causing Chagas disease. — Stock Photo
    Digital illustration of trypanosome parasite which causing Chagas disease.
    Giardia lamblia flagellated protozoan parasite, digital illustration. — Stock Photo
    Giardia lamblia flagellated protozoan parasite, digital illustration.
    Paramecium sp. ciliate protozoa — Stock Photo
    Paramecium sp. ciliate protozoa
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Digital illustration of trypanosome protozoan parasite causing sleeping sickness transmitted by blood. — Stock Photo
    Digital illustration of trypanosome protozoan parasite causing sleeping sickness transmitted by blood.
    Trypanosoma brucei protozoan — Stock Photo
    Trypanosoma brucei protozoan
    Group of Trichomonas hominis protozoan parasites, digital illustration. — Stock Photo
    Group of Trichomonas hominis protozoan parasites, digital illustration.
    Balamuthia mandrillaris amoeba, computer illustration. — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration.
    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration. — Stock Photo
    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration.
    Protozoan Plasmodium falciparum cell, causative agent of tropical malaria, digital illustration. — Stock Photo
    Protozoan Plasmodium falciparum cell, causative agent of tropical malaria, digital illustration.
    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
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration. — Stock Photo
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration.
    Illustration of malaria infected blood cells. — Stock Photo
    Illustration of malaria infected blood cells.
    Acanthamoeba castellanii amoeba in cerebrospinal fluid, digital illustration. — Stock Photo
    Acanthamoeba castellanii amoeba in cerebrospinal fluid, digital illustration.
    Plasmodium vivax protozoan inside red blood cells, digital illustration. — Stock Photo
    Plasmodium vivax protozoan inside red blood cells, digital illustration.
    Single Trichomonas hominis protozoan parasite, digital illustration. — Stock Photo
    Single Trichomonas hominis protozoan parasite, digital illustration.
    Giardia lamblia flagellated protozoan parasite, digital illustration. — Stock Photo
    Giardia lamblia flagellated protozoan parasite, digital illustration.
    Illustration of malaria infected blood cells. — Stock Photo
    Illustration of malaria infected blood cells.
    Cyst of Giardia intestinalis protozoan flagellated parasite in small intestine, digital illustration. — Stock Photo
    Cyst of Giardia intestinalis protozoan flagellated parasite in small intestine, digital illustration.
    Balamuthia mandrillaris amoeba, computer illustration. — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration.
    Protozoan infection in human intestinal lumen — Stock Photo
    Protozoan infection in human intestinal lumen
    Illustration of malaria infected blood cells. — Stock Photo
    Illustration of malaria infected blood cells.
    Plasmodium ovale protozoan, digital illustration. — Stock Photo
    Plasmodium ovale protozoan, digital illustration.
    Freshwater sponge (Spongilla sp.), coloured scanning electron micrograph (SEM). — Stock Photo
    Freshwater sponge (Spongilla sp.), coloured scanning electron micrograph (SEM).
    Plasmodium falciparum protozoan inside red blood cells, computer illustration — Stock Photo
    Plasmodium falciparum protozoan inside red blood cells, computer illustration
    Illustration of malaria infected blood cells. — Stock Photo
    Illustration of malaria infected blood cells.
    Protozoan infection in human intestinal lumen — Stock Photo
    Protozoan infection in human intestinal lumen
    Digital illustration of trypanosome parasite in blood causing Chagas disease. — Stock Photo
    Digital illustration of trypanosome parasite in blood causing Chagas disease.
    Plasmodium falciparum protozoan inside red blood cells, computer illustration — Stock Photo
    Plasmodium falciparum protozoan inside red blood cells, 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.
    Group of Trichomonas hominis protozoan parasites, digital illustration. — Stock Photo
    Group of Trichomonas hominis protozoan parasites, digital illustration.
    Giardia lamblia protozoan parasites in duodenum, digital illustration. — Stock Photo
    Giardia lamblia protozoan parasites in duodenum, digital illustration.
    Balamuthia mandrillaris amoeba, computer illustration — Stock Photo
    Balamuthia mandrillaris amoeba, 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
    Balamuthia mandrillaris amoeba, computer illustration — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Balamuthia mandrillaris amoeba, computer illustration — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration
    Computer illustration of giardiasis, an infection in the small intestine caused by the parasite giardia lamblia — Stock Photo
    Computer illustration of giardiasis, an infection in the small intestine caused by the parasite giardia lamblia
    Digital illustration of trypanosome protozoan parasite causing sleeping sickness transmitted by blood. — Stock Photo
    Digital illustration of trypanosome protozoan parasite causing sleeping sickness transmitted by blood.
    Coloured scanning electron micrograph (SEM) of a foraminiferan microfossil from maldives beach sand. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a foraminiferan microfossil from maldives beach sand.
    Protozoan Plasmodium falciparum, causative agent of tropical malaria, digital illustration. — Stock Photo
    Protozoan Plasmodium falciparum, causative agent of tropical malaria, digital illustration.
    Coloured scanning electron micrograph (SEM) of a foraminiferan microfossil from maldives beach sand. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a foraminiferan microfossil from maldives beach sand.
    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
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration. — Stock Photo
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration.
    Plasmodium ovale protozoan, computer illustration. — Stock Photo
    Plasmodium ovale protozoan, computer illustration.
    Digital illustration of trypanosome parasites causing Chagas disease. — Stock Photo
    Digital illustration of trypanosome parasites causing Chagas disease.
    Digital illustration of Acanthamoeba castellanii amoebas on white background. — Stock Photo
    Digital illustration of Acanthamoeba castellanii amoebas on white background.
    Plasmodium malariae protozoan parasite, digital illustration. — Stock Photo
    Plasmodium malariae protozoan parasite, digital illustration.
    Plasmodium ovale protozoan, computer illustration. — Stock Photo
    Plasmodium ovale protozoan, computer illustration.
    Plasmodium ovale protozoan parasite and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasite and red blood cell in flow, computer illustration.
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration. — Stock Photo
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration.
    Differential interference contrast light micrograph of different species of fossil unicellular radiolarians (protozoa). — Stock Photo
    Differential interference contrast light micrograph of different species of fossil unicellular radiolarians (protozoa).