The Toxocara canis life cycle normally involves dogs; humans are infected only accidentally.Unembryonated eggs are passed in feces of dogs (the definitive host).2.In the environment, eggs embryonate and become infective.
What is the life cycle of Toxocara canis?
Toxocara canis accomplishes its life cycle in dogs, with humans acquiring the infection as accidental hosts. 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.
What is the role of human in Toxocara canis life cycle?
Humans are accidental hosts who become infected by ingesting infective eggs in contaminated soil or infected transport hosts. After ingestion, the eggs hatch into larvae. 11. The larvae penetrate the intestinal wall and are circulated to various tissues (eg, liver, heart, lungs, brain, muscle, eyes).
How does Toxocara canis spread to humans?
Adults and children can become infected by accidentally swallowing dirt that has been contaminated with dog or cat feces that contain infectious Toxocara eggs. Although it is rare, people can also become infected from eating undercooked meat containing Toxocara larvae.
What is the infective stage of Toxocara?
In the environment, eggs embryonate and become infective. 3. After eggs are ingested by a dog, they hatch and release larvae, which penetrate the intestinal wall.
How long is roundworm life cycle?
Life Cycle: Between 2 and 3 months are required from ingestion of the infective eggs to oviposition by the adult female. Adult worms can live 1 to 2 years.
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