Echinococcus Granulosus

Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Echinococcus Granulosus


a tapeworm that in the adult stage parasitizes the intestines of dogs, wolves, jackals, and occasionally cats. The body measures 3–5 mm in length and consists of a scolex with four suckers and two crowns of hooks and three or four segments. The last segment, the only mature section, constitutes half the body length.

The tapeworm’s eggs emerge from the host’s intestine with excrement and may remain on its fur. The intermediate host, which may be a cow, sheep, pig, or other animal, or a human being, becomes infested by swallowing the eggs. The larva (oncosphere) emerges from the egg while in the intestine of the intermediate host. It penetrates into the portal vein system through the intestinal wall and is carried by the blood to the liver or, in some cases, to the lungs, muscles, bones, and other organs, where it develops into a hydatid. Every oncosphere creates a cyst, and secondary and tertiary cysts form on its walls. Numerous scolices similar to those of adult worms form on the secondary and tertiary cysts. The cysts grow very slowly and become quite large. The definitive host becomes infected by eating the flesh of a diseased or dead animal and ingesting a worm in the hydatid stage.

The varied structure of the hydatid stages of E. granulosus suggests there may be two independent species, E. unilocularis and E. multilocularis. The latter is sometimes recognized as an independent genus, Alveococcus.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Morphological and molecular characterization of Echinococcus granulosus in livestock and humans in Punjab, Pakistan.
Lateral flow test using Echinococcus granulosus native antigen B and comparison of IgG and IgG4 dipsticks for detection of human cystic echinococcosis.
Echinococcus granulosus in dogs and sheep in central Utah, 1971-1976.
Erume et al., "Identification of echinococcus granulosus strains using polymerase chain reaction-restriction fragment length polymorphism amongst livestock in moroto district, uganda," Onderstepoort Journal of Veterinary Research, vol.
Sensitized red blood cells are composed of sheep red blood cells coated with Echinococcus granulosus antigen.
Serological evaluation of five Echinococcus granulosus antigens for detecting cystic echinococcosis by ELISA.
Yong and Heath (1979) conducted immunodiagnostic tests for identification of sheep infected with Echinococcus granulosus and found accurate results.
Introduction: Hydatid cyst is a parasitic infestation that caused by echinococcus granulosus. In this article, we reported a pulmoner hydatid cyst case that the material is acquired by fexible bronchoscope to diagnostic purpose and confirmed pathologically.
In vitro scolicidal effects of Salvadora persica root extract against protoscolices of Echinococcus granulosus. Korean J.