amoebas are single-celled organisms. The so-called brain-eating amoeba is a species discovered in 1965. It's formal name is . Although first identified in Australia, this amoeba is believed to have evolved in the us

There are several species of Naegleria but only the fowleri species causes human disease. There are several fowleri subtypes. All are believed equally dangerous.

N. fowleri is microscopic: 8 micrometers to 15 micrometers in size, depending on its life stage and environment. By comparison, a hair  is 40 to 50 micrometers wide.

Like other amoebas, Naegleria reproduces by cell division. When conditions aren't right, the amoebas become inactive cysts. When conditions are favorable, the cysts turn into trophozoite the feeding form of the amoeba.

Amoeba

An amoeba is a type of cell or organism which has the ability to alter its shape, primarily by extending and retracting pseudopods. Amoebae do not form a single taxonomic group, but are found in every major lineage of eukaryotic organisms.

Although first identified in Australia, this amoeba is believed to have evolved in the U.S.. There are several ... These amoebas can be found in warm places around the globe

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