Question

Which stage of Wuchereria bancrofti is infective to man

• A. First stage larva
• B. Second stage larva
• C. Third stage larva
• D. Mature worm

Answer 1

Answer: (C)

Third stage larva

• Wuchereria bancrofti is a human parasitic roundworm that is the major cause of lymphatic filariasis.
• In the thoracic muscle of mosquito, microfilariae develop into first-stage larvae and subsequently into third-stage infective larvae.
• The third-stage infective larvae enter the blood of human by the mosquito. They then migrate to the nearest lymph gland where they mature into the thread like adult worms. Hence, the Third stage larva of Wuchereria bancrofti is infective to man.

So, the correct answer is 'Third stage larva'.