Echinococcus Granulosus

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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.

References in periodicals archive ?
First report of Echinococcus granulosus G8 in Eurasia and a reappraisal of the phylogenetic relationships of "genotypes" G5-G10.
parasite Khoram--abad Broujerd number percent number percent Echinococcus granulosus 10 46 6 27 Taenia hydatigena 8 29 8 29 Taenia multiceps 4 20 10 50 Dipylidium spp.
Direct interaction between EgFABP1, a fatty acid binding protein from Echinococcus granulosus, and phospholipid membranes.
When observed as a fresh mount, the cytology of the cyst contents was consistent with Echinococcus granulosus.
Immunodiagnosis of Echinococcus granulosus and a comparison of techniques for diagnosis of canine echinococcosis.
Cattle strain of Echinococcus granulosus and human infection.
He covers both Taenia and resultant cysticercosis, as well as Echinococcus granulosus infections and hydatid cysts.
6) With time other factors were proposed as putative initiators of EC, including parasitic infestation with Toxocara cati, (7) Echinococcus granulosus, (8) and Sparganum.
Infestation with the tapeworm Echinococcus granulosus accounts for the overwhelming majority of cases of hydatid disease.
Echinococcus granulosus is the most common cause of hydatid disease in man.