Entamoeba coli, E. hartmanni, E. polecki, Endolimax nana, and Iodamoeba buetschlii are generally considered nonpathogenic and reside in. Introduction. Iodamoeba butschlii is a non-pathogenic amoeba with world wide distribution although not as common as E. coli or E. nana. Its life cycle is similar. These include Entamoeba hartmanni, Entamoeba gingivalis, Entamoeba coli, Endolimax nana, and Iodamoeba butschlii (Fig. and Table ).

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Intestinal Protozoa: Amebas – Medical Microbiology – NCBI Bookshelf

The patient was treated with dehydroemetine and chloroquine. Entamoeba gingivalis normally lives in the gingival pockets near the base of the teeth in the human mouth, and may be coughed up in sputum specimens. It is found world wide, but like many other fecal-oral transmitted diseases, it is more prevalent in the tropics. Pulmonary infections generally result from a direct extension of the hepatic lesion across the diaphragm and into the pleura and lungs.

However, I do ask that you do not claim them as your own work, and give this site or myself credit when they are used publicly. The aspirate is usually a thick reddish brown liquid that rarely contains trophozoites. Liver function tests are usually normal or slightly abnormal and jaundice is unusual. Occasionally, and for no apparent reason, colonic infection with E histolytica will evoke a proliferative granulomatous response at an ulcer site.

Increased cervical shedding of HIV has been shown to be associated with cervical inflammation, and substantially increased viral loads in semen have been documented in men with trichomoniasis.


The free end of the string is taped to the patient’s face and the capsule is swallowed. After encystment, the nucleus divides twice to produce a quadrinucleate mature cyst. The abscess appears as a slowly enlarging liver mass.

Turn recording back on. In addition, the trophozoites of Dientamoeba survive outside of the body for a very short time. However, flagellar movement is poorly correlated with attachment and the surface lectins cover the entire trophozoite and are not specifically localized to the adhesive disk. The nature of protective immune responses is not clear. A unique ultrastructural feature of Giardia is the adhesive disk also called ventral disk, sucking disk, sucker, or striated disk. A single nucleus nu is found at the anterior end of the parasite.

Microphotographs All Micro photographs displayed on this blog were taken by myself except if noted otherwise. There are five members of the heavy chain family, members of the light chain family and 30 members of the intermediate chain family. Health education in regards to improving personal hygiene, sanitary disposal of feces, and hand washing are particularly effective.

Intestinal Amebae

January 3, Page last updated: For example, one phenotypic difference between E. The adhesive disk appears to be a relatively rigid structure and striations are evident by transmission electron microscopy.

For example, access to facilities is needed and organisms require days of growth before they are detected. Morphology of Dientamoeba fragilis from a stool sample. Contamination may come directly from infected food handlers or indirectly from faulty sewage disposal.

In addition, the wide range of genetic diversity might explain the controversy concerning the pathogenecity of Blastocystis in that some genotypes may be more virulent than others. Two trophozoites of E.


Fecal-oral transmission occurs when food preparation is not sanitary or when drinking water is contaminated. Ciliates undergo both an asexual reproduction ie, binary fission and a sexual reproduction involving conjugation Figure above.

Definitive diagnosis can only be made with the iron hematoxylin or trichrome stained preparation. If amebas pass down the colon they encyst buschlii the stimulus of desiccation, and then are evacuated with the stool. Otherwise the specimen should be preserved and stained due to trophozoite lability.

Intestinal Protozoa

The three family members are designated as amebapore A, B and C with amebapore A being predominant expressed. Earn a wage as a Medical Laboratory Technologist.

The clinical presentation of intestinal infections depends on the extent and anatomic location of the ulceration and mucosal damage. Fecal-oral transmission of cysts involves contaminated food or water.

There have been several reports of cultured amebas undergoing a change in zymodeme pattern after manipulation of associated bacterial flora. The clinical manifestations vary with the extent of involvement. Zymodeme patterns are of epidemiologic and research interest but their limited availability makes them less useful clinically. The trophozoites from all of these flagellates are somewhat teardrop shaped and contain a bitschlii nucleus and the cyst tend to be slightly elongated or oval.

Trophozoites can be found in diarrhea. The infection is acquired through the ingestion of cysts and the risk factors are similar to other diseases transmitted by the fecal-oral route see Table.