Toxocara canis larvae migrate from the gut(where they were ingested) to the small intestine of newborns. Toxocara canis also migrates to the lungs from the intestines. They move up the bronchial tree and the trachea to the pharynx, here they are swallowed by the newborn to finally reach the intestine.
Where is Toxocara canis found?
What is toxocariasis? Toxocariasis is an infection transmitted from animals to humans (zoonosis) caused by the parasitic roundworms commonly found in the intestine of dogs (Toxocara canis) and cats (T. cati).
How do dogs get Toxocara?
Dogs are infected with Toxocara by: Ingesting eggs. Ingesting an intermediate host. Becoming infected while in the uterus.
What is the intermediate host of Toxocara canis?
In the wild, carnivorous animals such as cats and dogs consume infected meat or simply soil containing the eggs, and the parasite persists in their gut. Additionally, transplacental transmission has been documented in dogs and cats. Humans are amongst a plethora of possible intermediate hosts.
What is the life cycle of Toxocara canis?
Following ingestion by dogs, the infective eggs hatch and larvae 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.
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