Giardia protozoan parasite

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LeírásGiardia lamblia SEM lores. Once an animal or person has been infected with this protozoan, the parasite lives in the intestine, giardia protozoan parasite is passed in the stool.

Because the parasite is protected by an outer shell, it can survive outside the body, and in the environment for long periods of time. Cysts are resistant forms and are responsible for transmission of giardiasis.

Giardia lamblia cyst under microscope at 40X.

Both cysts and trophozoites can be found in the feces diagnostic stages. The cysts are hardy and can survive several months in cold water.

Jelenleg 28 faja ismert: három halakban C. Az SSU-rRNS-alapú molekuláris vizsgálatok alapján megközelítőleg 60 ge- notípust írtak le, amelyek rendszertani helyzete bizony- talan és további vizsgálatokat igényel elhelyezésük [3].

Infection occurs by the ingestion of cysts in contaminated water, food, or by the fecal-oral route hands or fomites. Giardia protozoan parasite the small intestine, excystation releases trophozoites each cyst produces two trophozoites.

Trophozoites multiply by longitudinal binary fission, remaining in the lumen of the proximal small bowel where they can be free or attached to the mucosa by a ventral sucking disk. Encystation occurs as the parasites transit toward the colon.

Giardia-fertőzés (giardiasis)

The cyst is the stage found most commonly in non-diarrheal feces. Because the cysts are infectious when passed in the stool or shortly afterward, person-to-person transmission is possible.

While animals are infected with Giardia, their importance as a reservoir is unclear.