Un article de Wikipédia, l'encyclopédie libre.
[edit] Description
Description |
Malaria Plasmodium Plasmodium vivax Plasmodium ovale Plasmodium malariae Plasmodium knowlesi
malaria_LifeCycle(French_version).GIF
Traduction en français de l’image suivante :
malaria_LifeCycle.GIF
Life cycle of Malaria.
The malaria parasite life cycle involves two hosts. During a blood meal, a malaria-infected female Anopheles mosquito inoculates sporozoites into the human host . Sporozoites infect liver cells and mature into schizonts , which rupture and release merozoites . (Of note, in P. vivax and P. ovale a dormant stage [hypnozoites] can persist in the liver and cause relapses by invading the bloodstream weeks, or even years later.) After this initial replication in the liver (exo-erythrocytic schizogony ), the parasites undergo asexual multiplication in the erythrocytes (erythrocytic schizogony ). Merozoites infect red blood cells . The ring stage trophozoites mature into schizonts, which rupture releasing merozoites . Some parasites differentiate into sexual erythrocytic stages (gametocytes) . Blood stage parasites are responsible for the clinical manifestations of the disease. The gametocytes, male (microgametocytes) and female (macrogametocytes), are ingested by an Anopheles mosquito during a blood meal . The parasites’ multiplication in the mosquito is known as the sporogonic cycle . While in the mosquito's stomach, the microgametes penetrate the macrogametes generating zygotes . The zygotes in turn become motile and elongated (ookinetes) which invade the midgut wall of the mosquito where they develop into oocysts . The oocysts grow, rupture, and release sporozoites , which make their way to the mosquito's salivary glands. Inoculation of the sporozoites into a new human host perpetuates the malaria life cycle .
|
Source |
http://www.dpd.cdc.gov/DPDx/HTML/ImageLibrary/ malaria_LifeCycle.GIF
|
Date |
|
Author |
|
Permission
(Reusing this image) |
|
[edit] Licensing
Historique du fichier
Cliquer sur une date et une heure pour voir le fichier tel qu’il était à ce moment-là
| Date et heure | Dimensions | Utilisateur | Commentaire |
actuel | 13 mai 2007 à 10:13 | 543×435 (37 Kio) | Toxicotravail | |
Pages contenant l’image
Les pages ci-dessous contiennent cette image :