File:Mansonella streptocerca LifeCycle.gif

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Description

Filariasis

Life cycle of Mansonella streptocerca

During a blood meal, an infected midge (genus Culicoides) introduces third-stage filarial larvae onto the skin of the human host, where they penetrate into the bite wound. They develop into adults that reside in the dermis, most commonly less than 1 mm from the skin surface. The females measure approximately 27 mm in length. Their diameter is 50 μm at the level of the vulva (anteriorly) and ovaries (near the posterior end), and up to 85 μm at the mid-body. Males measure 50 μm in diameter. Adults produce unsheathed and non-periodic microfilariae, measuring 180 to 240 μm by 3 to 5 μm, which reside in the skin but can also reach the peripheral blood. A midge ingests the microfilariae during a blood meal. After ingestion, the microfilariae migrate from the midge's midgut through the hemocoel to the thoracic muscles. There the microfilariae develop into first-stage larvae and subsequently into third-stage larvae. The third-stage larvae migrate to the midge's proboscis and can infect another human when the midge takes another blood meal.

Source

http://www.dpd.cdc.gov/dpdx/images/ParasiteImages/A-F/Filariasis/M_streptocerca_LifeCycle.gif

Author

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Permission
(Reusing this file)

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.

File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:04, 5 November 2008		509 × 435 (32 KB)	Lycaon	Watermark removed
	21:10, 14 May 2006		509 × 435 (35 KB)	Patho	{{Information\| \|Description=Filariasis Life cycle of Mansonella streptocerca During a blood meal, an infected midge (genus Culicoides) introduces third-stage filarial larvae onto the skin of the human host, where they penetrate into the bite wound.