Eggs embryonate and become infective in the environment (2). Following ingestion by dogs (3), the infective eggs hatch and larvae penetrate the gut wall. In younger dogs, the larvae migrate through the lungs, bronchial tree, and esophagus; adult worms develop and oviposit in the small intestine (4).
What is the infective stage of Toxocara?
The infective stage of T. canis is the third-stage larva (L3). In transplacental infections, puppies may be born with L3 larvae in their lungs (Sherding, 1989). For diagnosis, large (70–85 μm in diameter) and relatively round ascarid eggs can be seen by standard fecal flotation methods.
How do roundworm eggs become infective?
The life cycle of the roundworm begins when eggs are passed with feces and deposited in the soil. It takes two to four weeks for the eggs to become infectious. A new host is infected by ingesting the eggs. The eggs hatch, releasing larvae that penetrate the walls of the small intestine and enter the bloodstream.
How long does it take for Toxocara canis ova to become infective?
After the eggs pass into the environment, it takes about 2 to 4 weeks for infective larvae to develop in the eggs. If a person ingests one of these infective eggs, then they can become infected with toxocariasis.
What is the main host of Toxocara?
Toxocara sp. Eggs are not clinically diagnostic for human cases as humans are incapable of harboring adult worms that pass eggs. Humans are paratenic hosts for Toxocara spp. and eggs are found only in the feces of definitive hosts (cats and dogs).
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