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Clockwise from top right: Amoeba proteus, Actinophrys sol, Acanthamoeba sp., Nuclearia thermophila., Euglypha acanthophora, neutrophil ingesting bacteria. An amoeba (/ ə ˈ m iː b ə /; less commonly spelled ameba or amœba; pl.: amoebas (less commonly, amebas) or amoebae (amebae) / ə ˈ m iː b i /), [1] often called an amoeboid, is a type of cell or unicellular organism with the ability ...
Naegleria fowleri, also known as the brain-eating amoeba, is a species of the genus Naegleria. It belongs to the phylum Percolozoa and is classified as an amoeboflagellate excavate , [ 1 ] an organism capable of behaving as both an amoeba and a flagellate .
It can be caused by Acanthamoeba [2] [3] or Entamoeba histolytica. [4]: 421 [5] When associated with Acanthamoeba, it is also known as "cutaneous acanthamoebiasis". [6] Balamuthia mandrillaris can also cause cutaneous amoebiasis, but can prove fatal if the amoeba enters the bloodstream [7] [8] It is characterized by ulcers. Diagnosis of ...
The amoeba thrives in warm freshwater, including lakes, rivers, and, occasionally, contaminated tap water or swimming pools. In 2020, a 6-year-old boy died in Texas after playing at a local splash ...
Cysts of Entamoeba can survive for up to a month in soil or for up to 45 minutes under fingernails. [2] Invasion of the intestinal lining results in bloody diarrhea. [2] If the parasite reaches the bloodstream it can spread through the body, most frequently ending up in the liver where it can cause amoebic liver abscesses. [2]
The trophozoites are the infective forms and are believed to gain entry into the body through the lower respiratory tract, ulcerated or broken skin and invade the central nervous system by hematogenous dissemination . Acanthamoeba spp. and Balamuthia mandrillaris cysts and trophozoites are found in tissue. [citation needed]
N. fowleri is typically found in warm bodies of fresh water, such as ponds, lakes, rivers and hot springs. It is found in an amoeboid , temporary flagellate stage or microbial cyst in soil, poorly maintained municipal water supplies, water heaters, near warm-water discharges of industrial plants and in poorly chlorinated or unchlorinated ...
These are roughly cylindrical with granular endoplasm and no subpseudopodia, as found in other members of the class Tubulinea. During locomotion one pseudopod typically becomes dominant and the others are retracted as the body flows into it. In some cases the cell moves by "walking", with relatively permanent pseudopodia serving as limbs.