Essay: Entamoeba histolytica

Entamoeba Histolytica is a single celled protozoan parasite endemic in most tropical and sub tropical parts of the world. It is the main causative agent of intestinal Amoebiasis infecting about 50 million people worldwide. This essay addresses the life cycle of the parasite in the human body.

The parasite life cycle occurs in two stages namely the trophozoite stage which is the infective stage and the cyst stage which is the non motile stage. Trophozoites are found in loose fresh faeces of mammals such as dogs and cats. Cysts on the other hand are able to survive in moist conditions outside the host and are transmitted to the host when swallowed releasing the trophozoite stage in the digestive tract. E. Histolytica infection causes amoebic dysentery or amoebic liver abscess with the patient developing various symptoms including abdominal pain, weight loss, blood in stools due to lesions on the intestinal walls, dysentery and amoeboma.

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