Image:Toxoplasmosis LifeCycle(French version).JPG

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Toxoplasma Life Cycle

Toxoplasmosis_LifeCycle(French_version).GIF

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Members of the cat family (Felidae) are the only known definitive hosts for the sexual stages of T. gondii and thus are the main reservoirs of infection. Cats become infected with T. gondii by carnivorism. After tissue cysts or oocysts are ingested by the cat, viable organisms are released and invade epithelial cells of the small intestine where they undergo an asexual followed by a sexual cycle and then form oocysts, which are excreted. The unsporulated oocyst takes 1 to 5 days after excretion to sporulate (become infective). Although cats shed oocysts for only 1 to 2 weeks, large numbers may be shed. Oocysts can survive in the environment for several months and are remarkably resistant to disinfectants, freezing, and drying, but are killed by heating to 70°C for 10 minutes.

Human infection may be acquired in several ways: A) ingestion of undercooked infected meat containing Toxoplasma cysts ; B) ingestion of the oocyst from fecally contaminated hands or food ; C) organ transplantation or blood transfusion; D) transplacental transmission; E) accidental inoculation of tachyzoites. The parasites form tissue cysts, most commonly in skeletal muscle, myocardium, and brain; these cysts may remain throughout the life of the host.

Source: CDC, http://www.dpd.cdc.gov/DPDx/HTML/ImageLibrary/Toxoplasmosis_il.asp?body=S-Z/Toxoplasmosis/body_Toxoplasmosis_il_th.htm

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This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright. Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. العربية | Български | Česky | Deutsch | English | Español | Français | Magyar | Italiano | 日本語 | 한국어 | Polski | Português | ‪中文(繁體)‬ | ‪中文(简体)‬ | +/-

[edit] Licensing

This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright. Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. العربية | Български | Česky | Deutsch | English | Español | Français | Magyar | Italiano | 日本語 | 한국어 | Polski | Português | ‪中文(繁體)‬ | ‪中文(简体)‬ | +/-

Les pages ci-dessous contiennent cette image :

• Toxoplasmose
• Utilisateur:Toxicotravail
• Wikipédia:Atelier graphique/Images à améliorer/Archives/Février 2008