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Brain-eating amoeba: Primary amoebic meningoencephalitis. Naegleria fowleri life cycle 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 micrometres in diameter and have a smooth, single-layered wall. Cyst.
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