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Naegleria fowleri
''Naegleria fowleri'' is a species of the genus ''Naegleria'', belonging to the phylum Percolozoa. It is a free-living pathogenic protist that causes the disease naegleriasis also known as primary amoebic meningoencephalitis. With a length of 8 micrometers to 15 micrometers in size, depending on its life stage and environment. By comparison, a human hair is 40 to 50 micrometers wide.
This microorganism is typically found in bodies of warm freshwater ponds, lakes, rivers, and hot springs. It is also found in the soil, near warm-water discharges of industrial plants, and in poorly or unchlorinated swimming pools, in an amoeboid or temporary flagellate stage. There is no indication of ''N. fowleri'' living in salt water.
==Lifecycle==
Naegleria fowleri is a thermophilic, free-living ameba. ''N. fowleri'' is found in warm freshwater ponds, lakes and rivers, and in the very warm water of hot springs. There is an increase in numbers as water temperature rises. It was first discovered in 1965, and first identified in Australia.〔(【引用サイトリンク】website=http://www.webmd.com/brain/brain-eating-amoeba )〕
''N. fowleri'' occurs in three forms – as a cyst, a trophozoite (ameboid), and a biflagellate. It does not form a cyst in human tissue. Only the amoeboid trophozoite stage exists in human tissue. The flagellate form can exist in the cerebrospinal fluid (CSF).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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