In the precystic forms, entamoeba remains only in the intestinal lumen. Of these entamoeba histolytica is the only species found to be associated with intestinal disease. Entamoeba histolytica is an anaerobic parasitic amoebozoan, part of the genus entamoeba. Several species of amebae are capable of colonizing the human gastrointestinal tract but, in contrast to entamoeba histolytica, are not considered pathogenic. This parasite has a global distribution and the disease it causes is usually characterized by diarrhea. The structure and life cycle of entamoeba with diagram. Entamoeba histolytica is an invasive, pathogenic protozoan, causing amoebiasis, and an important cause of diarrhea in developing countries.
Evaluation of entamoeba histolytica antigen and antibody pointofcare tests for the rapid diagnosis of amebiasis. Entamoeba histolytica y su relacion huespedparasito. Transactions of the royal society of tropical medicine and hygiene. 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. The genome of the protist parasite entamoeba histolytica pdf. Parasitic contamination on vegetables irrigated with awash river in selected farms. Dpdx is an educational resource designed for health professionals and laboratory scientists. The parasite above shows nuclei that have the typical small, centrally located karyosome, and thin, uniform peripheral chromatin. The nonpathogenic intestinal amebae include several entamoeba species e. Entamoeba histolytica is a protozoan parasite that infects man and animals.
Causal agent, life cycle, and geographic distribution. In reference diagnosis laboratories, molecular analysis by pcrbased cico is the method of choice for discriminating between the pathogenic species e. 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. Entamoeba histolytica introduction there is a large number of species of amoebae which parasitise the human intestinal tract.