See more ideas about entamoeba histolytica, medical laboratory and medical laboratory science. Entamoeba histolytica distribution parasite has worldwide distribution but is most common in the tropical and subtropical areas of the world. Entamoeba histolytica parasitology a protozoan that normally resides in the large intestine and may, under abnormal conditions, become pathogenic, enter the mucosa, producing flasklike ulcers and amebic dysentery. Although many people harbour this organism world wide, only about 10% develop clinically.
The protozoan parasite entamoeba histolytica, possibly other entamoeba spp transmission. Intestinal amoebiasis is characterized by severe colitis and. Entamoeba histolytica and entamoeba dispar basic guidelines a. Entamoeba histolytica is a human intestinal pathogen that affects more than 50 million people worldwide, leading to 100,000 deaths annually. Transmitted by the fecaloral route, ingestion of the infective cyst form occurs via contaminated food and water. 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.
Scribd is the worlds largest social reading and publishing site. Entamoeba histolytica, a protozoan parasite, is the etiologic agent of amoebiasis in humans. Entamoeba histolytica epidemiology a worldwide distribution. Predominantly infecting humans and other primates causing amoebiasis, e. Fecaloral route, either by eating or drinking fecally contaminated food or water or persontoperson contact such as by diaper changing or sexual activity. For asymptomatic infections, paromomycin or iodoquinol are the drugs of choice. Of these entamoeba histolytica is the only species found to be associated with intestinal disease. Trophozoite is the motile, feeding and pathogenic stage of e. The structure and life cycle of entamoeba with diagram. Entamoeba histolytica is an anaerobic parasitic amoebozoan, part of the genus entamoeba. View entamoeba histolytica research papers on academia. Entamoeba histolytica introduction there is a large number of species of amoebae which parasitise the human intestinal tract.
Entamoeba histolytica a number of outbreaks have resulted from a breakdown in sanitation or behavioral practices of people. For symptomatic intestinal disease or extraintestinal infections e. Multiple stool samples at least 3 should be tested before a negative result is reported. The life cycle of entamoeba histolytica, includes three stages, 1. The enteropathogen parasite entamoeba histolytica infects 10% of the worlds population 1 and causes 100,000 deaths per year 2. The pathogenic and nonpathogenic stages of entamoeba are recognized by schanotunn in 1903. Our understanding of its epidemiology has dramatically changed since this amoeba was distinguished from another morphologically similar one, entamoeba dispar, a non. To maximize recovery of cysts, stool samples in formalin, or other fixatives, should be concentrated prior to microscopic examination e. This quiz and worksheet combo will help you understand entamoeba histolytica and its role in the development of entamoebic disease, included three stages of disease. Causa disenterias diarreias graves com sangue e muco. A higher prevalence in tropical and subtropical countries 10 % of the world population carries the parasite. Entamoeba histolytica is an invasive, pathogenic protozoan, causing amoebiasis, and an important cause of diarrhea in developing countries. It exists in two formsthe trophozoite which is the active, dividing form, and the cyst which is dormant and can survive for prolonged periods outside the host.