Keywords: Naegleria fowleri lifecycle stages.JPG en Naegleria fowleri lifecycle stages A Cyst of N fowleri in culture Naegleria fowleri does not form cysts in human tissue Cysts in the environment and culture are spherical 7-15 µm in diameter and have a smooth single-layered wall Cyst http //www dpd cdc gov/dpdx/HTML/ImageLibrary/FreeLivingAmebic_il htm CDC PD-USGov Naegleria fowleri |