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Other names: Amoebic dysentery, amebiasis, entamoebiasis[1][2]
The life-cycle of various intestinal Entamoeba species
SpecialtyInfectious disease
SymptomsBloody diarrhea, abdominal pain[3]
ComplicationsSevere colitis, colonic perforation, anemia[3]
CausesAmoebas of the Entamoeba group[3][4]
Diagnostic methodStool examination, antibodies in the blood[3]
Differential diagnosisBacterial colitis[3]
PreventionImproved sanitation[3]
TreatmentTissue disease: metronidazole, tinidazole, nitazoxanide, dehydroemetine, chloroquine,
Intestinal infection: diloxanide furoate, iodoquinoline[3]
Frequency~480 million[3]

Amoebiasis, also known amoebic dysentery, is an infection caused by any of the amoebae of the Entamoeba group.[3] Symptoms are most common during infection by Entamoeba histolytica.[3] Amoebiasis can be present with no, mild, or severe symptoms.[3] Symptoms may include abdominal pain, diarrhea, or bloody diarrhea.[3] Cases with no symptoms may be more common than previously reported.[3] Complications can include inflammation and ulceration of the colon with tissue death or perforation, which may result in peritonitis.[3] People affected may develop anemia due to loss of blood.[3]

Cysts of Entamoeba can survive for up to a month in soil or for up to 45 minutes under fingernails.[3] Invasion of the intestinal lining results in bloody diarrhea.[3] If the parasite reaches the bloodstream it can spread through the body, most frequently ending up in the liver where it can cause amoebic liver abscesses.[3] Liver abscesses can occur without previous diarrhea.[3] Diagnosis is typical by stool examination using a microscope, but may not reliably exclude infection or separate between specific types.[3] An increased white blood cell count may be present in severe cases.[3] The most accurate test is finding specific antibodies in the blood, but it may remain positive following treatment.[3] Bacterial colitis can result in similar symptoms.[3]

Prevention of amoebiasis is by improved sanitation, including separating food and water from faeces.[3] There is no vaccine.[3] There are two treatment options depending on the location of the infection.[3] Amoebiasis in tissues is treated with either metronidazole, tinidazole, nitazoxanide, dehydroemetine or chloroquine, while luminal infection is treated with diloxanide furoate or iodoquinoline.[3] Effective treatment against all stages of the disease may require a combination of medications.[3] Infections without symptoms do not require treatment but infected individuals can spread the parasite to others and treatment can be considered.[3] Treatment of other Entamoeba infections apart from E. histolytica is not needed.[3]

Amoebiasis is present all over the world,[5] though most cases occur in the developing world.[6] About 480 million people are currently infected with about 40 million new cases per year with significant symptoms.[3][7] This results in the death of between 40,000 and 110,000 people a year.[3] Most infections are now believed due to E. dispar.[3] E. dispar is more common in certain areas.[3] The first case of amoebiasis was documented in 1875 and in 1891 the disease was described in detail, resulting in the terms amoebic dysentery and amoebic liver abscess.[3] Further evidence from the Philippines in 1913 found that upon swallowing cysts of E. histolytica volunteers developed the disease.[3]

Signs and symptoms

Specimen of the human intestine that was damaged by amebic ulcer.

Most infected people, about 90%, are asymptomatic,[8] but this disease has the potential to become serious. It is estimated that about 40,000 to 100,000 people worldwide die annually due to amoebiasis.[9]

Infections can sometimes last for years if there is no treatment. Symptoms take from a few days to a few weeks to develop and manifest themselves, but usually it is about two to four weeks. Symptoms can range from mild diarrhea to dysentery with blood, coupled with intense abdominal pains. Extra-intestinal complications might also arise as a result of invasive infection which includes colitis, liver, lung, or brain abscesses.[8] The blood comes from bleeding lesions created by the amoebae invading the lining of the colon. In about 10% of invasive cases the amoebae enter the bloodstream and may travel to other organs in the body. Most commonly this means the liver,[10] as this is where blood from the intestine reaches first, but they can end up almost anywhere in the body.Onset time is highly variable and the average asymptomatic infection persists for over a year. It is theorized that the absence of symptoms or their intensity may vary with such factors as strain of amoeba, immune response of the host, and perhaps associated bacteria and viruses.[11][12]

In asymptomatic infections, the amoeba lives by eating and digesting bacteria and food particles in the gut, a part of the gastrointestinal tract.[8]

It does not usually come in contact with the intestine itself due to the protective layer of mucus that lines the gut. Disease occurs when amoeba comes in contact with the cells lining the intestine. It then secretes the same substances it uses to digest bacteria, which include enzymes that destroy cell membranes and proteins. This process can lead to penetration and digestion of human tissues, resulting first in flask-shaped ulcerations in the intestine. Entamoeba histolytica ingests the destroyed cells by phagocytosis and is often seen with red blood cells inside when viewed in stool samples.[13][11]


Life-cycle of the Entamoeba histolytica

Amoebiasis is an infection caused by the amoeba Entamoeba histolytica, amoebiasis is sometimes incorrectly used to refer to infection with other amoebae, should be used only for Entamoeba histolytica infection.[11]

Other amoebae infecting humans include:[14]


Amoebiasis is usually transmitted by the fecal-oral route,[8] but it can also be transmitted indirectly through contact with dirty hands or objects as well as by anal-oral contact. Infection is spread through ingestion of the cyst form of the parasite, a semi-dormant and hardy structure found in feces. Any non-encysted amoebae, or trophozoites, die quickly after leaving the body but may also be present in stool: these are rarely the source of new infections.[8] Since amoebiasis is transmitted through contaminated food and water, it is often endemic in regions of the world with limited modern sanitation systems, including México, Central America, western South America, South Asia, and western and southern Africa.[20]

Amoebic dysentery is one form of traveler's diarrhea[21], although most traveler's diarrhea is bacterial or viral in origin.


Tissue damage caused by E. histolytica is a result of three main events, host cell death, inflammation, and parasite invasion. Abbreviations: EhMIF, E. histolytica macrophage migration inhibitory factor; MMP, matrix metalloproteinases.

E. histolytica causes tissue destruction which leads to clinical disease. E. histolytica–induced tissue damage by three main events: direct host cell death, inflammation, and parasite invasion. Once the trophozoites are excysted in the terminal ileum region, they colonize the large bowel, remaining on the surface of the mucus layer and feeding on bacteria and food particles. Occasionally, and in response to unknown stimuli, trophozoites move through the mucus layer where they come in contact with the epithelial cell layer and start the pathological process. E. histolytica has a lectin that binds to galactose and N-acetylgalactosamine sugars on the surface of the epithelial cells, The lectin normally is used to bind bacteria for ingestion. The parasite has several enzymes such as pore forming proteins, lipases, and cysteine proteases, which are normally used to digest bacteria in food vacuoles but which can cause lysis of the epithelial cells by inducing cellular necrosis and apoptosis when the trophozoite comes in contact with them and binds via the lectin. Enzymes released allow penetration into intestinal wall and blood vessels, sometimes on to liver and other organs. The trophozoites will then ingest these dead cells. This damage to the epithelial cell layer attracts human immune cells and these in turn can be lysed by the trophozoite, which releases the immune cell's own lytic enzymes into the surrounding tissue, creating a type of chain reaction and leading to tissue destruction. This destruction manifests itself in the form of an 'ulcer' in the tissue, typically described as flask-shaped because of its appearance in transverse section. This tissue destruction can also involve blood vessels leading to bloody diarrhea, amebic dysentery. Occasionally, trophozoites enter the bloodstream where they are transported typically to the liver via the portal system. In the liver a similar pathological sequence ensues, leading to amebic liver abscesses. The trophozoites can also end up in other organs, sometimes via the bloodstream, sometimes via liver abscess rupture or fistulas. Similarly, when the trophozoites travel to the brain, they can cause amoebic brain abscess.[22][23][24]



With colonoscopy it is possible to detect small ulcers of between 3–5mm, but diagnosis may be difficult as the mucous membrane between these areas can look either healthy or inflamed.[3] Trophozoites may be identified at the ulcer edge or within the tissue, using immunohistochemical staining with specific anti-E. histolytica antibodies.[6]

Asymptomatic human infections are usually diagnosed by finding cysts shed in the stool. Various flotation or sedimentation procedures have been developed to recover the cysts from fecal matter and stains help to visualize the isolated cysts for microscopic examination. Since cysts are not shed constantly, a minimum of three stools are examined. In symptomatic infections, the motile form is often seen in fresh feces. Serological tests exist, and most infected individuals test positive for the presence of antibodies. The levels of antibody are much higher in individuals with liver abscesses. Serology only becomes positive about two weeks after infection, more recent developments include a kit that detects the presence of amoeba proteins in the feces, and another that detects ameba DNA in feces.[11][25][26][27]

Microscopy is still by far the most widespread method of diagnosis around the world, however it is not as sensitive or accurate in diagnosis as the other tests available. It is important to distinguish the E. histolytica cyst from the cysts of nonpathogenic intestinal protozoa such as Entamoeba coli by its appearance. E. histolytica cysts have a maximum of four nuclei, while the commensal Entamoeba coli cyst has up to 8 nuclei. Additionally, in E. histolytica, the endosome is centrally located in the nucleus, while it is usually off-center in Entamoeba coli. Finally, chromatoidal bodies in E. histolytica cysts are rounded, while they are jagged in Entamoeba coli. The WHO recommends that infections diagnosed by microscopy alone should not be treated if they are asymptomatic and there is no other reason to suspect that the infection is actually E. histolytica. Detection of cysts or trophozoites stools under microscope may require examination of several samples over several days to determine if they are present, because cysts are shed intermittently and may not show up in every sample.[11][28][26][29]

Typically, the organism can no longer be found in the feces once the disease goes extra-intestinal. Serological tests are useful in detecting infection by E. histolytica if the organism goes extra-intestinal and in excluding the organism from the diagnosis of other disorders. An Ova & Parasite (O&P) test or an E. histolytica fecal antigen assay is the proper assay for intestinal infections. Since antibodies may persist for years after clinical cure, a positive serological result may not necessarily indicate an active infection. A negative serological result, however, can be equally important in excluding suspected tissue invasion by E. histolytica.[30][11][31]

Stool antigen detection tests have helped to overcome some of the limitations of stool microscopy. Antigen detection tests are easy to use, but they have variable sensitivity and specificity, especially in low-endemic areas.[6]

Polymerase chain reaction (PCR) is considered the gold standard for diagnosis but remains underutilized.[6][32]


Hand washing

To help prevent the spread of amoebiasis around the home :[11][33]

To help prevent infection:[11]

  • Avoid raw vegetables when in endemic areas, as they may have been fertilized using human feces.
  • Boil water when possible

Good sanitary practice, as well as responsible sewage disposal or treatment, are necessary for the prevention of E. histolytica infection on an endemic level. E.histolytica cysts are usually resistant to chlorination, therefore sedimentation and filtration of water supplies are necessary to reduce the incidence of infection.[8]

E. histolytica cysts may be recovered from contaminated food by methods similar to those used for recovering Giardia lamblia cysts from feces. Filtration is probably the most practical method for recovery from drinking water and liquid foods. E. histolytica cysts must be distinguished from cysts of other parasitic (but nonpathogenic) protozoa and from cysts of free-living protozoa as discussed above. Recovery procedures are not very accurate; cysts are easily lost or damaged beyond recognition, which leads to many falsely negative results in recovery tests.[34]



E. histolytica infections occur in both the intestine and (in people with symptoms) in tissue of the intestine and/or liver.[20] Those with symptoms require treatment with two medications, an amoebicidal tissue-active agent and a luminal cysticidal agent.[8] Individuals that are asymptomatic only need a luminal cysticidal agent.[6]

  • Metronidazole, or a related drug such as Tinidazole, is used to destroy amoebae that have invaded tissue.[35]
  • Several drugs are available for treating intestinal infections, the most effective of which has been shown to be Paromomycin.[35]

E. histolytica infections occur in both the intestine and in tissue of the intestine and/or liver. As a result, both tissue and luminal drugs are needed to treat the infection, one for each location. Metronidazole is usually given first, followed by Diloxanide.E. dispar does not require treatment, but many laboratories do not have the facilities to distinguish this from E. histolytica.[11][36]

The ingestion of one viable cyst may cause an infection.[37]Steroid therapy can lead to severe amoebic colitis in persons with asymptomatic or symptomatic E. histolytica infection.[38] Severe amoebic colitis is associated with high mortality, and on average more than 50% with severe colitis die.[38]


Significance of Amebiasis

In the majority of cases, amoebas remain in the gastrointestinal tract of the hosts. Severe ulceration of the gastrointestinal mucosal surfaces occurs in less than 16% of cases. In fewer cases, the parasite invades the soft tissues, most commonly the liver.[10]

Only rarely are masses formed that lead to intestinal obstruction. Other local complications include bloody diarrhea, pericolic and pericaecal abscess.Complications of hepatic amoebiasis includes subdiaphragmatic abscess, perforation of diaphragm to pericardium and pleural cavity, perforation to abdominal cavital and perforation of skin.[11][39]

Pulmonary amoebiasis can occur from liver lesions by spread through the blood or by perforation of pleural cavity and lung. It can cause lung abscess, pulmono pleural fistula, empyema lung and broncho pleural fistula. It can also reach the brain through blood vessels and cause amoebic brain abscess and amoebic meningoencephalitis. Cutaneous amoebiasis can also occur in skin around sites of colostomy wound, perianal region, region overlying visceral lesion and at the site of drainage of liver abscess.Urogenital tract amoebiasis derived from intestinal lesion can cause rectovesicle fistula and rectovaginal fistula.[11][40][41]

Entamoeba histolytica infection is associated with malnutrition and stunting of growth.[42]


Amoebiasis caused about 55,000 deaths worldwide in 2010, down from 68,000 in 1990.[43][44]

Nevertheless, this means that there are up to 50 million true E. histolytica infections and approximately seventy thousand die each year, mostly from liver abscesses or other complications. Although usually considered a tropical parasite, the first case reported (in 1875) was actually in St Petersburg in Russia, near the Arctic Circle.[45] Infection is more common in warmer areas, but this is because of both poorer hygiene and the parasitic cysts surviving longer in warm moist conditions.[20]


A 1933 World's Fair poster where one of the outbreaks occured

Amoebiasis was first described by Fedor A. Lösch in 1875, in northern Russia.[3][8]

The most dramatic incident in the US was the Chicago World's Fair outbreak in 1933, caused by contaminated drinking water. There were more than a thousand cases, with 98 deaths.[46][47]

It has been known since 1897 that at least one non-disease-causing species of Entamoeba existed (Entamoeba coli), but it was first formally recognized by the WHO in 1997 that E. histolytica was two species, despite this having first been proposed in 1925.[3] In addition to the now-recognized E. dispar, evidence shows there are at least two other species of Entamoeba that look the same in humans: E. moshkovskii and Entamoeba bangladeshi.[3]

The reason these species haven't been differentiated until recently is because of the reliance on appearance.[3]

In 1998 there was an outbreak of amoebiasis in the Republic of Georgia.[48] Between 26 May and 3 September 1998, 177 cases were reported, including 52 probable cases of liver abscess.[49]

The Nicobarese people have attested to the medicinal properties found in Glochidion calocarpum, a plant common to India, saying that its bark and seed are most effective in curing abdominal disorders associated with amoebiasis.[50]


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