The structure and life cycle of entamoeba with diagram. A possible function of entamoeba histolytica in the. Entamoeba histolytica is a human intestinal pathogen that affects more than 50 million people worldwide, leading to 100,000 deaths annually. Epidemiological studies from developed countries have reported an increasing prevalence of amoebiasis and of invasive infections, such as amoebic colitis, among men who have sex with men msm who engage in oralanal sex. Entamoeba histolytica is an anaerobic parasitic protozoan that infects the digestive tract of predominantly humans and other primates.
Dpdx is an educational resource designed for health professionals and laboratory scientists. For full access to this pdf, sign in to an existing account, or purchase an annual subscription. In industrialized countries, amebiasis usually occurs in migrants and. It inhabits the mucous and submucous layers of the large intestine. Entamoeba histolytica is the pathogen responsible for invasive amoebiasis which includes amoebic dysentery and amoebic liver abscesses. Introduction invasive amebiasis caused by entamoeba histolytica is a major source of parasite infectionrelated mortality worldwide, accounting for 40,60073,800 deaths annually. Pdf amebiasis is defined as infection with entamoeba histolytica, regardless of associated symptomatology. Entamoeba histolytica is an enteric protozoan parasite that infects humans, and is the etiological agent of amebiasis. Identification of entamoeba histolytica trophozoites in fresh.
Of these entamoeba histolytica is the only species found to be associated with intestinal disease. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Entamoeba histolytica is a histozoic, pathogenic and monogenetic parasite invading the mucosal and submucosal layers of the. Jan 23, 2016 pathogenesis and clinical features entamoeba histolytica causes intestinal and extraintestinal amoebiasis. Most infections are asymptomatic, but invasive intestinal disease may occur manifesting with several weeks of cramping, abdominal pain, watery or bloody diarrhea, and weight loss. Nov 15, 20 entamoeba histolytica distribution parasite has worldwide distribution but is most common in the tropical and subtropical areas of the world. Transmission occurs via ingestion of food and water contaminated with amebic cysts 1, 3, 4. Amoebiasis may present with no symptoms or mild to severe symptoms including abdominal pain, diarrhea, or bloody diarrhea.
Potentially fatal extraintestinal amoebiasis, including amoebic liver abscess, complicates 1%3% of infections. The detection of entamoeba histolytica, the causative agent of amebiasis, is an important goal of the clinical microbiology laboratory. The main reason of infection is the 31 contamination of food and water due to the poor sanitation. In industrialized countries, amebiasis usually occurs in. Entamoeba histolytica cause dangerous syndrome called amoebiasis amoebosis. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Laboratory diagnosis of amebiasis clinical microbiology. Entamoeba histolytica global water pathogen project. P852 introduction of entamoeba histolytica serology testing in the management of inflammatory bowel disease patients at university. Amebiasis remains a worldwide health problem accounting for up to 100,000 deaths annually 1, 2.
Entamoeba histolytica an overview sciencedirect topics. It is a parasite that infects an estimated 50 million people around the world and is a significant cause of morbidity and mortality in developing countries. Patients may present months to years after the initial infection. According to the best estimates walsh 1986 approximately 48 million individuals suffer from amoebiasis throughout the world. Among entamoeba species, 32 entamoeba histolytica is highly pathogenic while the other species are nonpathogenic and. This is because amebiasis is presently one of the three most common causes of death from parasitic disease. Eric houpt, chienching hung, in hunters tropical medicine and emerging infectious disease ninth edition, 20. Entamoeba histolytica is an anaerobic parasitic amoebozoan, part of the genus entamoeba. It feeds mainly on the tissues of the intestinal wall and often produces severe ulcers and abscesses. Entamoeba histolytica is an invasive, pathogenic protozoan, causing amoebiasis, and an important cause of diarrhea in developing countries. Several protozoan species in the genus entamoeba colonize humans, but not all of them are associated with disease. Genus entamoeba contains the most important of the amoebae causing disease in humans. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Entamoeba histolytica pathogenic protozoan of the large.
Introduction parasite is an organism baring food and shelter temporarily or permanent and living in or on another organism. Amoebiasis, or amoebic dysentery, is a term used to describe an infection caused by the protozoan entamoeba histolytica. Worldwide, approximately 50 million people develop colitis or extraintestinal disease, with over 100,000 deaths annually 3. Multiple stool samples at least 3 should be tested before a negative result is reported. Ppt entamoeba histolytica powerpoint presentation free to. Entamoeba histolytica symptoms, diagnosis, treatments and. Our understanding of its epidemiology has dramatically changed since this amoeba was distinguished from another morphologically similar one, entamoeba dispar, a non. Introduction entamoeba histolytica is a unicellular, protozoon parasite of humans.
Entamoeba histolytica infection in men who have sex with. Extraintestinal manifestations include amebic liver. Fecaloral route, either by eating or drinking fecally contaminated food or water or persontoperson contact such as by diaper changing or sexual activity. Entamoeba histolytica infection in humans, chimpanzees and.
Although the majority of individuals infected with e. Entamoeba histolytica is a protozoan parasite responsible for a disease called amoebiasis. As more is discovered about the molecular and cell biology of e. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Infection ranges from asymptomatic colonization of the large bowel to severe invasive intestinal and extraintestinal disease. Entamoeba histolytica introduction there is a large number of species of amoebae which parasitise the human intestinal tract. Risk factors for infection by the entamoeba histolyticae. Although many people harbour this organism world wide, only about 10% develop clinically. Some important species of entamoeba are described below. Entamoeba histolytica is the responsible parasite of amoebiasis and remains one of the top three parasitic causes of mortality worldwide. Entamoeba histolytica amebiasis infectious disease and. The gastrointestinal pathogen entamoeba histolytica causes amoebiasis. It commonly occurs in the lumen of the colon as a commensal, but sometimes invades the intestinal tissues to become a pathogen.
Most infections are asymptomatic, but may occasionally cause intestinal or extraintestinal disease. Amoebicabscess introduction entamoeba histolytica is a unicellular, protozoon parasite of humans. Intestinal amoebiasis the amoebae cause disease only when they invade the intestinal tissues. Entamoeba histolytica and another ameba, entamoeba dispar, which is about 10 times more common, look the same when seen under a microscope. With increased travel and emigration to developed countries, infection is becoming more common in nonendemic areas. Amoebiasis is defined as a human infection caused by entamoeba histolytica, regardless of the clinical symptoms. Severe complications may include inflammation and perforation resulting in peritonitis. Entamoeba histolytica is an enteric dwelling human protozoan parasite that causes the disease amoebiasis, which is endemic in the developing world. The protozoan parasite entamoeba histolytica, possibly other entamoeba spp transmission. The genus entamoeba was established by leidy in 1879. Entamoeba histolytica is microscopic and lives as an endoparasite in the upper part of the large intestine, i. Entamoeba histolytica and entamoeba dispar basic guidelines a. Outbreaks have occurred following water supply contamination, as the cysts are resistant. Entamoeba histolytica is morphologically indistinguishable from other nonpathogenic entamoeba species.
With the exception of entamoeba gingivalis, which lives in the. Pathogenesis and clinical features entamoeba histolytica causes intestinal and extraintestinal amoebiasis. A pure strain of entamoeba histolytica has been isolated and cultivated, and an attempt has been made to study and describe its whole lifehistory in detail this strain k. Recent studies have suggested that a considerable number of genes coding for proteolytic enzymes are present within the e. Pathogenesis and immune response toward entamoeba histolytica. Entamoeba histolytica is well recognized as a pathogenic ameba, associated with intestinal and extraintestinal infections. Amoebiasis is an intestinal disease caused by enteric protozoan called 30 entamoeba histolytica belongs to the genus entamoeba. Intestinal amebiasis is caused by the protozoan entamoeba histolytica. Amebiasis or amoebic dysentery is a common parasitic enteral infection. Entamoeba histolytica is a protozoan parasite that accounts for an estimated 100,000 annual deaths globally 1.
Infection ranges from asymptomatic colonization of the large bowel to invasive intestinal and extraintestinal disease, particularly liver abscess. Evaluation of entamoeba histolytica antigen and antibody pointofcare tests for the rapid diagnosis of amebiasis. Entamoeba histolytica, the causative agent of amebiasis, is a protozoan parasite that accounts for an estimated 100,000 annual deaths globally. Entamoeba histolytica a number of outbreaks have resulted from a breakdown in sanitation or behavioral practices of people.
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. Entamoeba histolytica distribution parasite has worldwide distribution but is most common in the tropical and subtropical areas of the world. However, in the phylogenetic classification of living organisms, the family entamoebidae, which includes e. Transmitted by the fecaloral route, ingestion of the infective cyst form occurs via contaminated food and water. Introduction entamoeba histolytica is an enteric protozoan parasite that causes the disease amebiasis, the second leading cause of death from intestinal parasitic disease worldwide, following cryptosporidiosis ali, 2015. Introduction entamoeba histolytica is an enteric anaerobic protozoan parasite that causes about 50 million infections with a death rate of over 100 000 worldwide annually who, 1997. Entamoeba histolytica is a protozoan parasite that accounts for an estimated 100,000 annual deaths. It moves by a jellylike tonguelike protrusion of the cytoplasmpseudopodium. The amoebic infection is the third most common cause of death among parasitic diseases, after malaria and. In morocco, a study was conducted from january 2007 to december 20 to outline the prevalence of intestinal parasites. It is caused by any of the amoebas of the entamoeba group.
Summary the detection of entamoeba histolytica, the causative agent of amebiasis, is an important goal of the clinical microbiology laboratory. In 1984, at least 40,000 deaths were attributed to amoebiasis. This parasite is present worldwide, but is more prevalent in developing countries. Entamoeba histolytica infection amoebiasis is the second leading cause of death from parasitic diseases.
Infection ranges from asymptomatic colonization of the large bowel to invasive intestinal and extraintestinal disease, particularly. A number of studies have shown that peptidases and in particular cysteine peptidases constitute major pathogenicity factors in entamoeba histolytica. Nov 20, 2015 entamoeba histolytica is a singlecelled protozoan parasite belonging to the sarcodinas group, which primarily includes amoeba characterized by their ability to move using shapeshifting temporary structures called pseudopodia. P852 introduction of entamoeba histolytica serology testing. Others such as entamoeba coli not to be confused with escherichia coli and entamoeba dispar are harmless.
Entamoeba histolytica is a pathogenic parasite in the intestine of human beings and many other primates. It feeds mainly on the tissues of the intestinal wall. In fact, the majority of cases in developed countries usually occur in immigrants. Identification of entamoeba histolytica trophozoites in. In fact, the majority of cases in developed countries. Entamoeba histolytica is an invasive enteric protozoan parasite that is the cause of amebiasis.
Entamoeba histolytica was first reported by losch 1875 in russia, but he described it as amoeba coli. Entamoeba invadens is a species that can cause a disease similar to e. 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. P852 introduction of entamoeba histolytica serology testing in the management of inflammatory bowel disease patients at university hospitals of leicester, uk d omeara. It occurs usually in the large intestine and causes internal inflammation as its name suggests histo tissue, lytic destroying. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that. Infection ranges from mostly asymptomatic colonization of the large bowel to invasive and potentially fatal intestinal and extraintestinal disease, with a special predilection for liver abscess formation. Phylogenetic analysis of ribosomal rna gene sequences has demonstrated the monophyletic nature of the entamoeba genus silberman et al.
Ppt entamoeba histolytica powerpoint presentation free. P852 introduction of entamoeba histolytica serology. Analysis of the genome allows new insight into the. Entamoeba histolytica is a singlecelled protozoan parasite belonging to the sarcodinas group, which primarily includes amoeba characterized by their ability to move using shapeshifting temporary structures called pseudopodia. Entamoeba histolytica infection in men who have sex with men. To maximize recovery of cysts, stool samples in formalin, or other fixatives, should be concentrated prior to microscopic examination e. Differential detection of entamoeba species in stool. Amoebiasis is caused by the parasite entamoeba histolytica. Introduction the protozoan parasite, entamoeba histolytica, is the causative agent of amoebiasis in humans. Morphology, life cycle, culture, pathogenicity introduction entamoeba histolytica is an anaerobic parasitic amoebozoa. Amebiasis chapter 4 2020 yellow book travelers health. Researches on the intestinal protozoa of monkeys and man.960 1242 940 573 945 332 201 229 107 761 1168 82 919 315 1412 1590 464 1572 843 1400 644 1457 47 245 878 1270 1619 1146 540 345 1122 1069 518 1306 877 664 1504 413 103 1101 509 950 456 1231 705 1415 773 374 936 1118