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[Acanthamoeba spp.] [Balamuthia mandrillaris] [Naegleria fowleri] [Sappinia spp.]

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.  Cysts have a single nucleus.

A

A: Cyst of N. fowleri in culture.