Oncosphere


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Oncosphere

 

one of the larval stages of most tapeworms. The body is spherical with three pairs of chitinous hooks; hence, an oncosphere is often called a hexacanth—literally, a six-hooked embryo. The oncosphere develops within an egg inside the worm’s uterus. The egg then leaves the body of the host in the host’s feces. The oncosphere continues to develop in water Or in the body of an intermediate host.

References in periodicals archive ?
Each egg contained an oncosphere that hatched and activated in small intestine.
A double etiopathogenic mechanism is possible, with the primitive blood-graft of oncosphere or hexcanth and a graft in the pelvic pouch of Douglas of protoscolices coming from the cracking of abdominal hydatid cysts.
The egg hatches in the intestinal tract and the oncosphere is freed migrates through the intestinal wall and gains access via the circulatory system to the muscles brain and other tissues of the host where it transforms into the metacestode form or cysticercus.
Hydatid disease is a zoonosis caused by the infestation of the oncosphere (embryo) of Echinococcus Granulosus.
5,8,10) The eggs are round to oval in shape, measure an average of 25-40 [micro]m in diameter, and contain an oncosphere with 6 hooklets.
multilocularis are sensitive to environmental factors: elevated temperature and desiccation can effectively reduce oncosphere infectivity (Veit et al.
Induction of protection against porcine cysticercosis by vaccination with recombinant oncosphere antigens.
The egg hatches in the small intestine and releases an oncosphere.
14) Some cysticercus antigens can react with anti-sera against T solium adult and oncosphere, indicating that they also have common antigens.
The eggs release the oncosphere (immature larvae) in the animal's intestine.
Humans are accidental hosts and get infected by ingestion of embiyonated eggs, which then hatches in the small intestine and releases an oncosphere that moves to the circulatory system by penetrating small intestine wall and gets lodged in different organs, in particular liver and lungs.
Following ingestion by a human or ungulate intermediate host (sheep, goats, pigs, cattle, horses, and camels), an oncosphere larva is released from the egg.