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Entamoeba coli
''Entamoeba coli'' is a non-pathogenic species of ''Entamoeba'' that frequently exists as a commensal parasite in the human gastrointestinal tract. ''E. coli'' (not to be confused with the bacterium ''Escherichia coli'') is important in medicine because it can be confused during microscopic examination of stained stool specimens with the pathogenic ''Entamoeba histolytica''. This amoeba does not move much by the use of its pseudopod, and creates a "''sur place'' (non-progressive) movement" inside the large intestine. Usually, the amoeba is immobile, and keeps its round shape. This amoeba, in its trophozoite stage, is only visible in fresh, unfixed stool specimens. Sometimes the ''Entamoeba coli'' have parasites as well. One is the fungus ''Sphaerita'' spp. This fungus lives in the cytoplasm of the ''E. coli''.〔http://www.atlas-protozoa.com/Entamoebacoli.php〕 While this differentiation is typically done by visual examination of the parasitic cysts via light microscopy, new methods using molecular biology techniques have been developed.
The scientific name of the amoeba, ''E. coli'', is often mistaken for the bacterium, ''Escherichia coli''. Unlike, the bacterium, the amoeba is mostly harmless, and does not cause as many intestinal problems like some of the strains of ''E. coli''. Some of these harmful strains are inside raw or uncooked meat that is consumed. For example, the bacterium, ''E. coli O157:H7'', which can cause illness, and even death, if eaten. To make the naming of these organisms less confusing, "alternate contractions" are used to name the species for the purpose making the naming easier; for example, using ''Esch. coli'' and ''Ent. coli'' for the bacterium and amoeba, instead of using ''E. coli'' for both.〔https://books.google.com/books?id=-ePLBQAAQBAJ&pg=PA9&lpg=PA9&dq=escherichia+coli+vs+entamoeba+coli&source=bl&ots=n0ivD5FvhF&sig=QLzoj0XsaYfXJWMgTG_iTfvGvEE&hl=en&sa=X&ei=hVk6VYGTHeTasASNhYDgBQ&ved=0CB0Q6AEwADgK#v=onepage&q=escherichia%20coli%20vs%20entamoeba%20coli&f=false〕〔http://www.microscope-microscope.org/applications/pond-critters/protozoans/sarcodina/entamoeba.htm〕
==Clinical significance==
The presence of ''E.coli'' is not cause in and of itself to seek treatment as it is considered harmless.〔http://www.cdc.gov/parasites/nonpathprotozoa/biology.html〕 However, when a person becomes infected with this benign entamoeba, other pathogenic organisms may have been introduced as well, and these other pathogens might cause infection or illness.〔http://www.cdc.gov/dpdx/intestinalAmebae/〕
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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