Which of the following stages of the filarial worm is released into the bloodstream of the human host?

Adult parasite

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Microfilariae

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Parasite eggs

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None of the above

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Solution

The correct option is B Microfilariae
Lymphatic filariasis is spread by mosquitoes. The swollen lymph nodes of the patient contain the parasitic worms. The adult parasites mate in the lymph nodes and the female produce thousands of larvae called microfilariae. These microfilariae are released into the bloodstream of the human host where they circulate in the blood vessels.

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