What is the Infective stage of the following parasite? HookwormsStrongyloides stercoralis
Filariform larva
Hookworms and Strongyloides stercoralis have different infective stages.
For hookworms, the infective stage is the third-stage (L3) larvae. These larvae develop in the soil, and can penetrate the skin of humans when they come into contact with infected soil. Once inside the body, the larvae migrate to the lungs and then the small intestine, where they mature into adult worms.
For Strongyloides stercoralis, the infective stage is also the third-stage (L3) larvae. These larvae hatch from eggs that are passed in the feces of an infected person. The larvae can infect new hosts by penetrating the skin, or by being ingested in contaminated food or water. Once inside the body, the larvae migrate to the lungs and then the small intestine, where they mature into adult worms.
It’s worth noting that both hookworms and Strongyloides stercoralis can also have a free-living cycle in the soil, where they develop from eggs to larvae to infective stages. In this cycle, the larvae of both parasites can continue to develop and remain infective for several weeks to months, depending on environmental conditions.
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