Giardia cysts in environment
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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, and is passed in the stool.
- [Cryptosporidium and Giardia as water contaminant pathogens in Hungary].
- Orv Hetil.
- OKI | Alapfeladataink
- Gyermekben férgek kezelése, ha
Because the parasite is protected by an outer shell, it can survive outside the body, and in the environment for giardia cysts in environment periods of time. Cysts are resistant forms and are responsible for transmission of giardiasis.
Fájl:Giardia lamblia SEM 8698 lores.jpg
Both cysts and trophozoites can be found in the feces diagnostic stages. The cysts are hardy and can survive several months in cold water. Infection occurs by the ingestion of cysts in contaminated water, food, or by the fecal-oral route hands or fomites.
Giardiasis - Giardia lamblia Infection
In 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. 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.