Naegleria fowleri takes three forms depending on conditions

Naegleria fowleri is a free-living amoeba capable of leading an autonomous life or parasitizing the human nervous system. It develops in three distinct forms during its cycle, including the amoeboid trophozoite, the transient flagellated form, and the resistant cyst. These forms measure between 7 and 30 micrometers depending on their morphological and environmental state.