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| View Original: | Toxocara_canis_LifeCycle(French_version).GIF (435x596) | |||
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| Keywords: Toxocara canis LifeCycle(French version).GIF Toxocara caniNematoda Toxocaridae Toxocara_canis_LifeCycle French_version GIF Traduction en français de l ™image suivante Toxocara_canis_LifeCycle GIF Toxocara canis accomplishes its life cycle in dogs with humans acquiring the infection as accidental hosts Following ingestion by dogs the infective eggs yield larvae that penetrate the gut wall and migrate into various tissues where they encyst if the dog is older than 5 weeks In younger dogs the larvae migrate through the lungs bronchial tree and esophagus; adult worms develop and oviposit in the small intestine In the older dogs the encysted stages are reactivated during pregnancy and infect by the transplacental and transmammary routes the puppies in whose small intestine adult worms become established Thus infective eggs are excreted by lactating bitches and puppies Humans are paratenic hosts who become infected by ingesting infective eggs in contaminated soil After ingestion the eggs yield larvae that 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 http //www dpd cdc gov/DPDx/HTML/ImageLibrary/Toxocariasis/ Toxocara_canis_LifeCycle GIF centre for disease control gov PD-USGov Toxocara c life cycle PD-USGov CDC lifecycles | ||||
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