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Non-pathogenic intestinal protozoa are single-celled parasites commonly found in the intestinal tract but never associated with illness. They are not found in the cells that line the intestines, and they do not spread to other parts of the body.Entamoeba histolytica-related diarrheal illnesses have recently been reported to have a negative impact on the growth of children. Despite the availability of effective therapy, morbidity and mortality associated with amebic infection have persisted, suggesting that interventions designed to limit or to eliminate disease are ineffective. As humans appear to be the only host, an appropriate control program could potentially eradicate amebiasis.
Asymptomatic human infections are usually diagnosed by finding cysts shed in the stool. Since cysts are not shed constantly, a minimum of three stools should be examined. Serological tests exist and most individuals will test positive for the presence of antibodies. The levels of antibody are much higher in individuals with liver abscesses.Many intestinal protozoa parasites inhabit the gastrointestinal tract of humans. However, majority of them are non-pathogenic commensals or only result in mild disease while a few of them such as Cryptosporidium parvum (CP), Entamoeba histolytica (EH) and Giardia lamblia (GL) are pathogenic and have been associated with human gastrointestinal disorders worldwide among children and adults alike