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    Cryptococcus gattii fungus, computer illustration. — Stock Photo
    Cryptococcus gattii fungus, computer illustration.
    Giardia lamblia single-celled protozoan parasite in human duodenum, digital artwork. — Stock Photo
    Giardia lamblia single-celled protozoan parasite in human duodenum, digital artwork.
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    Acanthamoeba castellanii amoeba in cerebrospinal fluid, digital illustration. — Stock Photo
    Acanthamoeba castellanii amoeba in cerebrospinal fluid, 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.
    Entamoeba histolytica invading the intestine — Stock Photo
    Entamoeba histolytica invading the intestine
    Giardia lamblia protozoan parasites in duodenum, digital illustration. — Stock Photo
    Giardia lamblia protozoan parasites in duodenum, digital illustration.
    Giardia lamblia protozoan parasite, digital illustration — Stock Photo
    Giardia lamblia protozoan parasite, digital illustration
    Balamuthia mandrillaris amoeba organisms, digital illustration. — Stock Photo
    Balamuthia mandrillaris amoeba organisms, digital illustration.