Entamoeba histolytica was first of all reported by a Russian Zoologist, Losch (1875), as Amoeba coli from the faeces of a patient suffering from dysentery. The genus Entamoeba was established by Cosagrandi and Barbagallo (1895); it should not, be confused with the genus Endamoeba which was established by Leidy (1879).
Acanthamoeba has two evolutive forms, the metabolically active trophozoite and a dormant, stress-resistant cyst. Trophozoites are small, usually 15 to 25 μm in length and amoeboid in shape. Trophozoites are small, usually 15 to 25 μm in length and amoeboid in shape.
Trophozoites can turn into temporary non-feeding flagellated forms which usually revert back to the trophozoite stage. Trophozoites infect humans or animals by penetrating the nasal mucosa, usually during swimming or sinus irrigation , and migrating to the brain via the olfactory nerves causing primary amebic meningoencephalitis (PAM).
Paniker's Textbook of Medical Parasitology, 7th Edition (2013) [PDF]
20 3.24 STOOL MICROSCOPY Three protozoan parasites which may be found in human stool are: - Rhizopodea (amoebae) e.g. Entamoeba histolytica - Zoomastigophora (flagellates) e.g. Giarelia Intesinalis - Ciliatea (ciliates) e.g. Balantidium coli EXAMININATION OF FAECES It is viewed under light microscope at x10 and x40 First you view ...