File:Strongyloides LifeCycle en (01).tif

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This is an illustration of the life cycle of Strongyloides stercoralis, the causal agent of Strongyloidiasis. The Strongyloides stercoralis life cycle is complex, alternating between free-living and parasitic cycles and involving autoinfection. In the free-living cycle: Rhabditiform larvae are passed in the stool of an infected definitive host image , develop into either infective filariform larvae (direct development) image or free-living adult males and females image that mate and produce eggs image , from which rhabditiform larvae hatch image and eventually become infective filariform (L3) slarvae image . The filariform larvae penetrate the human host skin to initiate the parasitic cycle (see below) image . This second generation of filariform larvae cannot mature into free-living adults and must find a new host to continue the life cycle.

Parasitic cycle: Filariform larvae in contaminated soil penetrate human skin when skin contacts soil image , and migrate to the small intestine image . It has been thought that the L3 larvae migrate via the bloodstream and lymphatics to the lungs, where they are eventually coughed up and swallowed. However, L3 larvae appear capable of migrating to the intestine via alternate routes (e.g. through abdominal viscera or connective tissue). In the small intestine, the larvae molt twice and become adult female worms image . The females live embedded in the submucosa of the small intestine and produce eggs via parthenogenesis (parasitic males do not exist) image , which yield rhabditiform larvae. The rhabditiform larvae can either be passed in the stool image (see “Free-living cycle” above), or can cause autoinfection image .
Source https://phil.cdc.gov/Details.aspx?pid=3419
Author CDC/Alexander J. da Silva, PhD/Melanie Moser, Courtesy: Public Health Image Library

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This file, which was originally posted to https://phil.cdc.gov/Details.aspx?pid=3419, was reviewed on 11 July 2023 by reviewer TheSandDoctor, who confirmed that it was available there under the stated license on that date.

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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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current15:54, 15 September 2019Thumbnail for version as of 15:54, 15 September 20193,150 × 2,400 (21.65 MB)Rasbak (talk | contribs){{Information |description=This is an illustration of the life cycle of ''Strongyloides stercoralis'', the causal agent of Strongyloidiasis. |source=http://www.publicdomainfiles.com/show_file.php?id=13520139013874 |date= |author=CDC/Alexander J. da Silva, PhD/Melanie Moser, Courtesy: Public Health Image Library |permission= |other versions= }} =={{int:license-header}}== {{LicenseReview}} Category:Strongyloides stercoralis == {{int:license-header}} == {{PD-USGov}}

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