This parasite lives in the intestines and produces eggs cysts which are passed out of the body in the stool. Its life cycle consists of three stages trophozoite or vegetative, precystic and cystic stages. Nov 10, 2017 ascaris lumbricoides is an intestinal round worm. Entamoeba histolytica and intestinal amoebiasis the nepali. Fotedar r, stark d, beebe n, marriott d, ellis j, harkness j. Entamoeba histolytica is an invasive, pathogenic protozoan, causing amoebiasis, and an important cause of diarrhea in developing countries. This is a pathogenic amoeba that causes a gastrointestinal disease known as ambiasis. Morphology, life cycle, culture, pathogenicity introduction entamoeba histolytica is an anaerobic parasitic amoebozoa. Evaluation of entamoeba histolytica antigen and antibody point of care tests for the rapid diagnosis of amebiasis.
The life cycle of the parasite is represented by two forms. Life cycle of entamoeba histolytica entamoeba histolytica is an anaerobic parasitic amoebozoan, part of the genus entamoeba. It is the growing or feeding stage of the parasite. The epidemiology of entamoeba histolytica in mexico city. The parasite is responsible for amoebiasis and liver absceses. Amoebiasis, also known amoebic dysentery, is an infection caused by any of the amoebae of the entamoeba group. Recent observations on the morphology of the amebas encountered in the human intestine, and on their life cycle, have shown conclusively that there are two species of entamebas parasitic in the intestine of man, entamoeba histolytica and entamoeba coli, and that in rare instances species belonging to the genus vahlkampfia, normally free living, may lead a semiparasitic existence. Entamoeba is a parasitic organism that lodges in the large intestine and colonizes it, causing internal inflammation. When diagnosing amebic infections it is important to separate nonpathogenic species. The other species are important because they may be confused with e.
Entamoeba coli life cycle and location identical to. Entamoeba histolytica is morphologically indistinguishable from other nonpathogenic entamoeba species. The quadrinucleate cyst is resistant to the gastric environment and passes unaltered through the stomach. It commonly occurs in the lumen of the colon as a commensal, but sometimes invades the intestinal tissues to become a pathogen. Entamoeba histolytica and another ameba, entamoeba dispar, which is about 10 times more common, look the same when seen under a microscope. Morphology, life cycle, pathogenesis, clinical manifestation, lab diagnosis and treatment entamoeba histolytica is a common protozoan parasite found in the large intestine of human.
Infections range from asymptomatic colonization to amebic colitis and. Cyst cysts are susceptible to heat above 40 c, freezing below 5 c, and drying. Entamoeba histolytica was first discovered by losch in 1875 in leningrad, russia for causing disease in humans. Entamoeba histolytica is well recognized as a pathogenic ameba, associated with intestinal and extraintestinal infections. The number of infected persons is estimated to be more. He life cycle of a entamoeba histolytica it is developed and completed in a single guest.
In this article we will discuss about entamoeba histolytica. Chalmers, in microbiology of waterborne diseases second edition, 2014. Entamoeba histolytica is a common protozoan parasite found in the large intestine of human. Entamoeba entamoeba histolytica is a type of amoeba that lives in the human alimentary canal. Sep 18, 2017 entamoeba is a genus of amoeboid protozoa that live in the human intestine.
Losch 1875 first described entamoeba histolytica as amoeba coli. The infection is acquired through the ingestion of cysts and the risk factors are similar to other diseases transmitted by the fecaloral route see table. Our understanding of its epidemiology has dramatically changed since this amoeba was distinguished from another morphologically similar one, entamoeba dispar, a non pathogenic and commensal parasite. This results in severe diarrhea with blood and mucus present. Entamoeba histolytica is a monogenetic endoparasite. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience.
Geographical distribution entamoeba histolytica is worldwide in. Of these entamoeba histolytica is the only species found to be associated with intestinal disease. Amebiasis is defined as infection with entamoeba histolytica, regardless of associated symptomatology. Morphology, life cycle, pathogenesis, clinical manifestation, lab diagnosis and treatment. For most part, they are harmless and feed on various bacteria and particles that may be present in the intestine.
Entamoeba is a genus of amoeboid protozoa that live in the human intestine. These are the motile, feeding and pathogenic forms. Entamoeba coli is a nonpathogenic species of entamoeba that frequently exists as a commensal parasite in the human gastrointestinal tract. Three distinct morphological forms exist in its life cycle. They undergo encystment but before encystment, the parasites round up, eliminate food vacuoles and accumulate considerable amount of food materials in the form of glycogen and black rodlike chromatoid granules. Ppt entamoeba histolytica powerpoint presentation free to. Symptoms are most common during infection by entamoeba histolytica.
Entamoeba histolytica and intestinal amoebiasis the. The structure and life cycle of entamoeba with diagram. The main method for diagnosing entamoeba polecki is by the identification of trophozoites in feces, utilizing preserved, stained, and microscopically examined. Amoebiasis definition, causes, symptoms, treatment. Geographical distribution of entamoeba histolytica 3. The extrinsic phase in which sexual reproduction occurs, is referred to as definitive and the intrinsic phase, with asexual reproduction, as intermediate. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Amoebiasis can be present with no, mild, or severe symptoms. Entamoeba histolytica is an intestinal protozoan parasite of humans that causes amebic colitis and amebic liver abscess. Some species within this genus are harmless, while others are pathogenic. Nov 22, 2019 entamoeba histolytica is an anaerobic intestinal amoeba parasite that predominantly affects a man and causes amoebic dysentery and liver abscess. Entamoeba histolytica is an anaerobic intestinal amoeba parasite that predominantly affects a man and causes amoebic dysentery and liver abscess history.
It is the third leading parasite cause of death in the developing countries. Ppt entamoeba histolytica powerpoint presentation free. Malaria parasites of man pass through two stages in their life cycle an extrinsic phase in anopheles mosquito and an intrinsic phase in man fig. This is parasitology video lecture of all about entamoeba histolytica. Life history of entamoeba histolytica parasitology. Entamoeba histolyticaentamoeba dispar trophozoites stained with trichrome entamoeba histolyticaentamoeba dispar trophozoites have a single nucleus, which have a centrally placed karyosome and uniformly distributed peripheral chromatin. Losch discovered amoeba in ulcers of the colon at autopsy and induced it to a. The adult worm lives in small intestine and grow to a length of more than 30 cm. Morphology, life cycle, pathogenesis, lab diagnosis and treatment ascaris lumbricoides is an intestinal round worm.
Once they reach the stomach, the low ph of stomach acid causes e. Entamoeba histolytica is a parasite and lives in the mucous and submucous layers of the large. Mar 10, 2014 life cycle of entamoeba histolytica 1. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Let us have a detailed look at the symptoms and causes of amoebiasis. Morphology entamoeba histolytica occurs in 3 forms trophozoite precyst cyst 4. Amoebiasis or more correctly it should be called as amoebic dysentery is caused by a protozoan parasite known as entamoeba histolytica. Invasive amebiasis caused by entamoeba histolytica is a major source of parasite infectionrelated mortality worldwide, accounting for 40,60073,800 deaths annually. Very young persons, pregnant women, recipients of corticosteroids, and malnourished individuals appear more susceptible than others to amebic colitis. The mature quadrinucleate cysts are the infective forms. The genus entamoeba phylum sarcodina, order amoebida, family endamoebidae is one of the many amoebae that inhabit the human gastrointestinal tract, including dientamoeba fragilis, entamoeba histolytica, entamoeba coli, entamoeba dispar, entamoeba gingivalis, entamoeba hartmanni, entamoeba moshkovskii, entamoeba polecki, chilomastix mesnili, endolimax nana, and iodamoeba butschlii. It is an intestinal illness caused by a parasite entamoeba histolytica. Contents morphology life cycle pathogenesis intestinal amoebiasis clinical features extraintestinal amoebiasis diagnosis treatment prevention 3.
Entamoeba histolytica is an invasive, pathogenic protozoan. If trophozoites penetrate the intestinal wall, serious. Dpdx is an educational resource designed for health professionals and laboratory scientists. Entamoeba histolytica is a an anaerobic parasitic protozoan that is responsible for the development of amoebiasis. In this article we will discuss about the life history of entamoeba histolytica, explained with the help of suitable diagrams. The adult stages of entamoeba are called trophozoites. The genome of the protist parasite entamoeba histolytica pdf. The life cycle of entamoeba histolytica, includes three stages, namely a. Technologists must be able to differentiate this organism from e. Symptoms may include abdominal pain, diarrhea, or bloody diarrhea. Trophozoites migrate to the large intestine and lodge in to the submucosal tissue. Differentiating entamoeba histolytica, en tamoeba dispar and. The amoeba has three stages in its life cycle, viz.
Winner of the standing ovation award for best powerpoint templates from presentations magazine. Protozoa anatomy, classification, life cycle and microscopy. Entamoeba histolytica life cycle morphology laboraotry. Infection by entamoeba histolytica occurs by ingestion of mature quadrinucleate cysts in fecally contaminated. Entamoeba histolytica an overview sciencedirect topics. It is the largest intestinal nematode to infect human. Following ingestion, what is the life cycle of entamoeba. Infections range from asymptomatic colonization to amebic colitis and life threatening abscesses.1500 580 1563 172 39 858 1235 1480 1234 590 748 44 237 868 488 1551 760 1066 958 597 1036 1302 792 722 799 862 691 517 153 294 1489 772 1 1038 500 1206 412 585 1228 1154 1160