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Entamoeba histolytica must be differentiated from other intestinal protozoa including: E. coli, E. hartmanni, E. gingivalis, Endolimax nana, and Iodamoeba buetschlii (the nonpathogenic amebae); Dientamoeba fragilis (which is a flagellate not an ameba); and the possibly pathogenic Entamoeba polecki.
Epidemiology. Amebiasis is distributed worldwide, particularly in the tropics, most commonly in areas of poor sanitation. E. histolytica is a common diarrheal pathogen in returned travelers. Long-term travelers (duration >6 months) are much more likely than short-term travelers (duration <1 month) to develop E. histolytica infection.
Clinical Description. Infection of the large intestine by Entamoeba histolytica may result in an illness of variable severity ranging from mild, chronic diarrhea to fulminant dysentery. Infection also may be asymptomatic. Extraintestinal infection also can occur (e.g., hepatic abscess).
Amebiasis ( Entamoeba histolytica) | 1990 Case Definition. Top of Page. Last Reviewed: April 16, 2021. Source: Office of Public Health Data, Surveillance, and Technology. Access Amebiasis (Entamoeba histolytica) case definitions; uniform criteria used to define a disease for public health surveillance.
Entamoeba histolytica is an anaerobic parasitic amoebozoan, part of the genus Entamoeba. [1] Predominantly infecting humans and other primates causing amoebiasis, E. histolytica is estimated to infect about 35-50 million people worldwide. [1] E. histolytica infection is estimated to kill more than 55,000 people each year. [2]
Oct 6, 2022 · Entamoeba histolytica is an enteric protozoan parasite with worldwide distribution. It is responsible for amoebic dysentery (bloody diarrhea) and invasive extraintestinal amebiasis (such as liver abscess, peritonitis, and pleuropulmonary abscess). Other species of Entamoeba; Entamoeba hartmanii, Entamoeba coli, and Entamoeba dispar do not cause ...
Wet mount. Entamoeba histolytica and Entamoeba dispar are morphologically identical species. In bright-field microscopy, E. histolytica/E. dispar cysts are spherical and usually measure 12 to 15 μm (range may be 10 to 20 μm). A mature cyst has 4 nuclei while an immature cyst may contain only 1 to 3 nuclei. Peripheral chromatin is fine ...
