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a genus of small tapeworms.
Echinococcus granulo´sus a species parasitic in dogs and wolves and occasionally in cats; its larvae may develop in nearly all mammals, forming hydatid cysts in the liver, lungs, kidneys, and other organs. It reverses the usual process of development in human and animal hosts: the adult is found in the intestine of dogs, whereas the larva develops in the human intestine, penetrates the intestinal wall, and settles in various organs, most often the liver, where it forms a cyst (hydatid cyst) that grows slowly. Treatment is by surgical removal of the cyst. This type of worm infection is fortunately not common in the United States.
Echinococcus multilocula´ris a species whose adult forms usually parasitize the fox and wild rodents, although humans are sporadically infected. It resembles E. granulosus, but the larvae form alveolar or multilocular rather than unilocular cysts.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


A genus of small taeniid tapeworms, two to five segments in adult worms; adults are found in various carnivores but not in humans; larvae, in the form of hydatid cysts, are found in the liver and other organs of ruminants, pigs, horses, rodents, and humans (for example, sheep herders living closely with their infected dogs, contact with infected feces).
[echino- + G. kokkos, a berry]
Farlex Partner Medical Dictionary © Farlex 2012


n. pl. echino·cocci (-kŏk′sī′, -kŏk′ī′)
Any of several parasitic tapeworms of the genus Echinococcus, the larvae of which infect mammals and form large, spherical cysts in the liver or lungs, causing serious or fatal disease.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


A genus of very small tapeworms; adults are found in various carnivores but not in humans; larvae, in the form of hydatid cysts, are found in the liver and other organs of ruminants, pigs, horses, rodents, and, under specific epidemiologic circumstances, humans (in whom disease is called hydatid disease). Worm has been studied in offensive biowarfare programs.
[echino- + G. kokkos, a berry]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


(e-ki?no-kok'us) [L. echinus, fr Gr echinos, hedgehog, sea urchin + coccus]
A genus of very short tapeworms.
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Echinococcus granulosus

A species that infests dogs and other carnivores. Its hydatid (larva) develops in other mammals, including humans, and causes the formation of hydatid cysts in the liver or lungs. Synonym: dog tapeworm
See: illustration; hydatid

Echinococcus hydatidosus

A species characterized by development of daughter cysts from the mother cyst.
See: hydatid

Echinococcus multilocularis

A species that primarily infests foxes and moles. It is the cause of alveolar hydatid disease in humans, one of the deadliest helminthic infections.

Echinococcus oligarthrus

A species found primarily in the tropics, where it colonizes wild cats. It may cause echinococcal cysts in humans.

Echinococcus vogeli

A species that causes polycystic hydatid disease (a neotropical parasitic infection).


(ĕ-kī″nŏ-kok′ŭs) (ĕ-kī″nŏ-kok′sī″) plural.echinococci
A tapeworm of the genus Echinococcus.
Medical Dictionary, © 2009 Farlex and Partners


One of several tapeworms of the genus Echinococcus , the larvae of which form large, spherical cysts in the tissues, including the brain, causing serious or fatal disease.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


a larval tapeworm (metacestode) which develops several daughter cysts each of which has several scoleces (pl. of SCOLEX).
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Cringoli, "Development of a real-time PCR for the differentiation of the G1 and G2/G3 genotypes of Echinococcus granulosus," Parasitology Research, vol.
Immunological characterization of Echinococcus granulosus cyclophilin, an allergen reactive with IgE and IgG4 from patients with cystic echinococcosis.
Arc 5 antibodies insera of sheep infected with Echinococcus granulosus, Taenia hydatigena and Taeniaovis.
Contingent, non-neutral evolution in a multicellular parasite: natural selection and gene conversion in the Echinococcus granulosus antigen B gene family.
Protoscolex and hook structures of Echinococcus parasite were not observed in painted and unpainted microscopic examination of our patient's knee joint aspiration fluid.
Hydatid cyst disease is a zoonosis caused by the larval stage of the parasite Echinococcus granulosus, a member of the order Cestoda, the family Taeniidae.
Hydatid disease is a zoonotic infection affecting humans and other mammals, caused by the larval stages of tapeworm belonging to the genus echinococcus. Humans are the accidental intermediate host and become infected when they accidentally ingest eggs of the tapeworm.
Abstract Prevalence of Echinococcus granulosus genotype G1 was investigated in 55 cattle 129 buffaloes 10 sheep and 10 goat samples by polymerase chain reaction (PCR).
In fact, some of dogs' parasites are zoonotic agents and thus important in public health, e.g., Echinococcus granulosus, Toxocara canis, and Giardia intestinalis [2].
Hydatid disease is a zoonosis caused by the infestation of the oncosphere (embryo) of Echinococcus Granulosus.
Being a main bearer of mature forms of parasite, they can excrete up to 8,500 echinococcus eggs, Dydabayev says.