File:Giardia LifeCycle.gif

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Description
English: Giardiasis [Giardia intestinalis (syn. Giardia lamblia)]

Life cycle of Giardia intestinalis

Cysts are resistant forms and are responsible for transmission of giardiasis. Both cysts and trophozoites can be found in the feces (diagnostic stages). The cysts are hardy, 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). 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.
Source http://www.dpd.cdc.gov/dpdx/images/ParasiteImages/G-L/Giardiasis/Giardia_LifeCycle.gif
Author CDC
Public domain
This image is a work of the Centers for Disease Control and Prevention, part of the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.

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current21:03, 13 May 2006Thumbnail for version as of 21:03, 13 May 2006435 × 559 (27 KB)wikimediacommons>Patho {{Information| |Description=Giardiasis [Giardia intestinalis (syn. Giardia lamblia)] Life cycle of Giardia intestinalis Cysts are resistant forms and are responsible for transmission of giardiasis. Both cysts and trophozoites can be found in the f

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