Naegleria fowleri

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This photomicrograph of a brain tissue specimen depicts the cytoarchitectural changes associated with a free-living, Naegleria fowleri, amebic infection. Free-living amebae belonging to the genera Acanthamoeba, Balamuthia, and Naegleria are important causes of disease in humans and animals, though only one specie of Naegleria, Naegleria fowleri, causes disease in humans.