The life cycle of Entamoeba histolytica begins when humans ingest infective cysts via feces, fingers, food, fomites, and fleas. Then the cyst passes to the small intestine where excystation occurs and trophozoites multiply asexually by binary fission. The diagnostic stage is marked by resistant, infective cysts passed in feces.

The life cycle of Entamoeba histolytica begins when humans ingest infective cysts via feces, fingers, food, fomites, and fleas. Then the cyst passes to the small intestine where excystation occurs and trophozoites multiply asexually by binary fission. The diagnostic stage is marked by resistant, infective cysts passed in feces.

Entamoeba histolytica ( or E. dispar) Trophozoite characteristics

Entamoeba histolytica ( or E. dispar) Trophozoite characteristics

Pequeno atlas de parasitologia

Pequeno atlas de parasitologia

Entamoeba histolytica (trophozoite) | Motility: progressive unidirectional movement | Pseudopod: finger-like | Nucleus: 1 | Karyosome: Central | Peripheral Chromatin: Fine | Cytoplasm: Clean | Inclusions: RBCs

Entamoeba histolytica (trophozoite) | Motility: progressive unidirectional movement | Pseudopod: finger-like | Nucleus: 1 | Karyosome: Central | Peripheral Chromatin: Fine | Cytoplasm: Clean | Inclusions: RBCs

Trophozoites of E. histolytica with ingested erythrocytes stained with trichrome. The ingested erythrocytes appear as dark inclusions. The parasite above show nuclei that have the typical small, centrally located karyosome, and thin, uniform peripheral chromatin

Trophozoites of E. histolytica with ingested erythrocytes stained with trichrome. The ingested erythrocytes appear as dark inclusions. The parasite above show nuclei that have the typical small, centrally located karyosome, and thin, uniform peripheral chromatin

Entamoeba histolytica  /  E. moshkovskii  /  E.dispar:  trofozoíto (A) y quiste inmaduro (B) teñidos con Lugol (A:10-60 µm...

Entamoeba histolytica / E. moshkovskii / E.dispar: trofozoíto (A) y quiste inmaduro (B) teñidos con Lugol (A:10-60 µm...

Entamoeba histolytica cyst

Entamoeba histolytica cyst

A certain parasitic amoeba (Entamoeba histolytica) kills about 70,000 people each year, but how exactly it causes apparent, devastating tissue damage has been unclear. Recently, a group of researchers found that the amoebas actually kill a person's cells by eating those cells alive! It's a very unusual tactic. You can read more about it at http://www.biology-bytes.com/  (Image credit: Stefan Walkowski)

A certain parasitic amoeba (Entamoeba histolytica) kills about 70,000 people each year, but how exactly it causes apparent, devastating tissue damage has been unclear. Recently, a group of researchers found that the amoebas actually kill a person's cells by eating those cells alive! It's a very unusual tactic. You can read more about it at http://www.biology-bytes.com/ (Image credit: Stefan Walkowski)

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