Entamoeba Histolytica – Class 12 | Chapter – 8 | Biology Short Notes Series PDF

Entamoeba Histolytica: It is a protozoan that causes intestinal amebiasis as well as extra-intestinal manifestations. Although 90 percent of E. histolytica infections are asymptomatic, nearly 50 million people become symptomatic, with about 100,000 deaths yearly. This activity reviews the evaluation and treatment of amebiasis caused by Entamoeba histolytica and highlights the role of the inter-professional team in evaluating and treating patients with this condition.

It is an enteric protozoan parasite and the causative agent of amoebiasis in humans. Parasite cysts are transmitted through contaminated food and water, making the incidence of disease high in areas of poor sanitation.

Life Cycle of Entamoeba Histolytica

  • Stage 1 (Cyst): Infection occurs by ingestion of mature cysts through fecally contaminated water or food. Due to protection from walls, cysts survive several days and sometimes weeks. They are responsible for transmission.
  • Stage 2 (Excystation): Excystation is the process by which cysts transform into trophozoites. When the cysts enter the ileum of the small intestine of the host, the process of excystation begins. Trophozoites are released in the small intestine and from here they migrate to the large intestine.
  •  Stage 3 (Trophozoite): Trophozoites are unicellular parasites that measure from 14 to 18 mm in diameter. They multiply in the small intestine by binary fission to produce cysts that exit via human stool. Several trophozoites remain inside the lumen of the small intestine. The rest attach themselves to the intestinal mucosa, enter the bloodstream and further grow in the extraintestinal regions of the host like lungs, liver, brain.

JOIN OUR TELEGRAM CHANNELS
Biology Quiz & Notes Physics Quiz & Notes Chemistry Quiz & Notes

Follow on Facebook

By Team Learning Mantras