Image:Babesia LifeCycle(French version).GIF
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Babesia_LifeCycle(French_version).GIF (544 × 435 pixels, taille du fichier : 28 Kio, type MIME : image/gif)
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The life cycle of Babesia' , the causal agents of en: Babesiosis. Babesia_LifeCycle(French_version).GIF Traduction en français des légendes de l’image suivante : Babesia_LifeCycle.GIF The Babesia microti life cycle involves two hosts, which includes a rodent, primarily the white-footed mouse, Peromyscus leucopus. During a blood meal, a Babesia-infected tick introduces sporozoites into the mouse host . Sporozoites enter erythrocytes and undergo asexual reproduction (budding) . In the blood, some parasites differentiate into male and female gametes although these cannot be distinguished at the light microscope level . The definitive host is a tick, in this case the deer tick, Ixodes dammini (I. scapularis). Once ingested by an appropriate tick , gametes unite and undergo a sporogonic cycle resulting in sporozoites . Transovarial transmission (also known as vertical, or hereditary, transmission) has been documented for “large” Babesia spp. but not for the “small” babesiae, such as B. microti . Humans enter the cycle when bitten by infected ticks. During a blood meal, a Babesia-infected tick introduces sporozoites into the human host . Sporozoites enter erythrocytes and undergo asexual replication (budding) . Multiplication of the blood stage parasites is responsible for the clinical manifestations of the disease. Humans are, for all practical purposes, dead-end hosts and there is probably little, if any, subsequent transmission that occurs from ticks feeding on infected persons. However, human to human transmission is well recognized to occur through blood transfusions . Note: Deer are the hosts upon which the adult ticks feed and are indirectly part of the Babesia cycle as they influence the tick population. When deer populations increase, the tick population also increases, thus heightening the potential for transmission
Image credit: CDC/Alexander J. da Silva, PhD/Melanie Moser (PHIL #3378), 2002. |
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Originally from Babesia_LifeCycle.GIF here. |
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phil |
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PD-USGOV-HHS-CDC. |
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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 during the course 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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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.
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| Date et heure | Dimensions | Utilisateur | Commentaire | |
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| actuel | 19 mai 2007 à 09:19 | 544×435 (28 Kio) | Toxicotravail | ({{Information |Description=The life cycle of ''Babesia' , the causal agents of '''''en: Babesiosis'''''. Babesia_LifeCycle(French_version).GIF Traduction en français des légendes de l’image suivante : Babesia_LifeCycle.GIF The Babesia mic) |
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