Naegleria fowleri
The three life stages of Naegleria fowleri The amoeba almost always infects humans in the trophozoite stage (elongated structure shown at center), when it is actively feeding and multiplying. When environmental conditions become unfavorable, such as during winter, the amoeba develops flagella (threadlike appendages used for locomotion, attached to pear-shaped structures shown at bottom) and moves about in search...