Question

Which of the following statements are correct in relation to Wuchereria?

• A. Only (i), (ii) and (iii) are correct
• B. Only (i), (iv) and (v) are correct
• C. Only (iii) and (v) are correct
• D. Except (i), all are correct

Hint:

Remember the nocturnal periodicity of Wuchereria microfilariae and its ovoviviparous nature for identifying correct statements.

Answer 1

The Correct Option is B

Step 1: Understand the life cycle of Wuchereria.
- Wuchereria bancrofti is a parasitic filarial worm transmitted by female Anopheles mosquitoes.
- It is ovoviviparous: eggs develop inside the female and hatch as microfilariae.

Step 2: Statement analysis.
- (i) Ovoviviparous - Correct
- (ii) Completes life cycle in man and female mosquito- Only mosquito transmits larval stages; humans host adult worms
- (iii) Male and female worms coiled together - Adult worms occupy lymphatics, not coiled in blood
- (iv) Microfilaria larva surrounded by loose cuticular sheath - Correct
- (v) Microfilaria moves to peripheral blood at night -Correct (nocturnal periodicity)

Step 3: Identify correct statements.
- Correct statements: (i), (iv), (v)

Step 4: Eliminate incorrect options.
- (ii) and (iii) are incorrect based on parasite biology.

Step 5: Conclusion.
- The statements correct in relation to Wuchereria are (i), (iv), and (v).