Filariform larvae is the infective stage of the parasite: infection occurs when larvae in soil penetrate the skin, or when they are ingested through contaminated food and water following skin penetration.
Which is the infective stage of hookworm infection?
Life Cycle (intestinal hookworm infection): The released rhabditiform larvae grow in the feces and/or the soil , and after 5 to 10 days (and two molts) they become filariform (third-stage) larvae that are infective . These infective larvae can survive 3 to 4 weeks in favorable environmental conditions.
What are the stages of the hookworm?
Hookworms are large, multicellular organisms which infect their host as an immature larva by penetrating the skin. They then migrate via the bloodstream to the lungs, break through the alveoli and migrate up the trachea to be swallowed, finally residing in the small intestine as adult worms.
Which stage is the infective form of Ancylostoma life cycle?
The infective stage of Ancylostoma duodenale to humans is known as filariform larva. This form generally enters the body of host either by swallowing or by burrowing into the skin through hair follicles.
What is the feeding stage of hookworm?
Hookworm eggs gain nutrition via the host feces. After penetrating the skin, juveniles attach to blood vessels and begin to feed. The larval stage is free-living where there is independent existence in the soil. They then penetrate the host's skin by the secretion of digestive enzymes that dissolve the skin.
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