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11020

PHIL Image 11020

ID#:11020
Description:This photomicrograph revealed some of the ultrastructural morphology exhibited by an adult cestode, Echinococcus granulosus, which had been found in a dog. E. granulosus causes what is known as “cystic echinococcosis”. As dogs and other canids are the only definitive hosts for Echinococcus, adults are not expected to be found in the human host. Adults range from 3mm - 6mm in length and usually consist of a scolex, and three proglottids. The third (terminal) proglottid is gravid, and is longer than wide, as can be seen in this instance. The scolex contains four suckers and a rostellum with 25 - 50 hooks.

Being that dogs and other canids are the definitive hosts for Echinococcus spp., humans are only infected by the larvae after ingestion of eggs from food, water or fomites contaminated with dog feces. Upon ingestion of the eggs by the human host, the oncospheres migrate from the intestinal lumen to other body sites where they develop into hydatid cysts. These cysts can be found in any part of the body, but are most common in the liver, lung and central nervous system.

High Resolution:Right click here and select "Save Target As..." for hi-resolution image (4.20 MB)
Content Providers(s):CDC/ Dr. Peter M. Schantz
Creation Date:1975
Photo Credit:
Links:
  • CDC – Div. of Parasitic Diseases, DPDx; Echinococcosis: Echinococcus granulosus
    Categories:
    CDC Organization

    MeSH
    tree picture Diseases
    tree picture tree picture Animal Diseases
    tree picture tree picture Parasitic Diseases
    tree picturetree picture tree picture Helminthiasis
    tree picturetree picturetree picture tree picture Cestode Infections
    tree picturetree picturetree picturetree picture tree picture Echinococcosis
    tree picture Organisms
    tree picture tree picture Animals
    tree picturetree picture tree picture Invertebrates
    tree picturetree picturetree picture tree picture Helminths
    tree picturetree picturetree picturetree picture tree picture Platyhelminths
    tree picturetree picturetree picturetree picturetree picture tree picture Cestoda
    tree picturetree picturetree picturetree picturetree picturetree picture tree picture Echinococcus
    Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.
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