Toxascaris leonina is a common parasitic roundworm found in dogs, cats, foxes, and related Toxascaris leonina differs from other Toxocara in that the larvae do not migrate through the lungs; but rather, the though less frequently implicated than is Toxocara canis, the most common roundworm parasite found in dogs. Toxocara canis is worldwide-distributed helminth parasite of dogs and other canids. Toxocara canis is gonochoristic, adult worms measure from 9 to 18 cm, are. Toxocariasis is a zoonotic disease of great importance in terms of its morbidity that Toxocara canis and its clinical and epidemiological relevance in the human beings, .. del Bacillus thurigiensis, como estrategias de control biológico del vector. . No homem o ciclo de vida do parasita não se completa.

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Ocular Toxocariasis — United States, — Toxocariasis is caused by larvae of Toxocara canis dog roundworm and less frequently of T.

Toxocara canis accomplishes its cic,o cycle in dogs, with humans acquiring the infection as accidental hosts.


Unembryonated eggs are shed in the feces of the definitive host. Eggs embryonate and become infective in the environment. Following ingestion by dogsthe infective eggs hatch and larvae penetrate the gut wall.

toxocara canis antigens: Topics by

In younger dogs, the larvae migrate through the lungs, bronchial tree, and esophagus; adult worms develop and oviposit in the small intestine. In older dogs, patent infections can biolobico occur, but larval encystment in tissues is more common.

Encysted stages are reactivated in female dogs during biopogico pregnancy and infect by the transplacental and transmammary routes the puppiesin whose small intestine adult worms become established.

Puppies are a major source of environmental egg contamination. Toxocara canis can also be transmitted through ingestion of paratenic hosts: The life cycle is completed when dogs eat these hosts and the larvae develop into egg-laying adult worms in the small intestine. Humans are accidental hosts who become infected by ingesting infective eggs in contaminated soil or infected caanis hosts.

After ingestion, the eggs hatch and larvae penetrate the intestinal wall and are carried by the circulation to a wide variety of tissues liver, heart, lungs, brain, muscle, eyes. While the larvae do not undergo any further development in these sites, they can cause severe local reactions that are the basis of toxocariasis.


The two main clinical presentations of toxocariasis are visceral larva migrans and ocular larva migrans. Cais is usually made by serology or the finding of larvae in biopsy or autopsy specimens. Life cycle image and information courtesy of DPDx. Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content.

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Get Email Updates To receive email updates about this page, enter your email address: January 10, Page last updated: January 10, Content source: Global Health cicol Division of Parasitic Diseases.