Whichh stage of wuchereria bancrofti is infective to man

Options

A. (a) first stage larve
B. (b) second stage larva
C. (c) third stage larva
D. (d) mature worm

Answer

**Step-by-Step Solution:**

1. **Understand the Question**: The question asks which stage of the parasite Wuchereria bancrofti is infective to humans.

2. **Identify the Parasite**: Wuchereria bancrofti is a parasitic worm that causes filariasis, a disease characterized by swollen lymph nodes.

3. **Study the Life Cycle**: The life cycle of Wuchereria bancrofti involves both humans and mosquitoes. The mosquito acts as a vector for the parasite.

4. **Identify the Stages of Larvae**: The larvae of Wuchereria bancrofti go through several stages:
- First stage larvae (L1)
- Second stage larvae (L2)
- Third stage larvae (L3)

5. **Determine the Infective Stage**: The L3 stage larvae are the infective form that can be transmitted to humans. This occurs when an infected female mosquito bites a human, depositing the L3 larvae into the skin.

6. **Conclusion**: The correct answer to the question is the third stage larva (L3), as this is the stage that is infective to humans.

**Final Answer**: The infective stage of Wuchereria bancrofti to humans is the **third stage larva (L3)**.

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