Widespread infection of which of the following disease can't be controlled by the use of larvivorous fish like Gambusia?

Options

A. Malaria
B. Chikungunya
C. Ringworm
D. Dengue

Answer

To determine which disease's widespread infection cannot be controlled by the use of larvivorous fish like Gambusia, we can analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Gambusia**: Gambusia is a type of larvivorous fish that feeds on mosquito larvae. It is commonly used as a biological control agent to reduce mosquito populations in stagnant water.

2. **Option A: Malaria**:
- Malaria is caused by the Plasmodium protozoan and is transmitted through the bites of infected female Anopheles mosquitoes.
- Since Gambusia feeds on mosquito larvae, introducing it into water bodies can help reduce the mosquito population and, consequently, the incidence of malaria.
- **Conclusion**: Gambusia can help control malaria.

3. **Option B: Chikungunya**:
- Chikungunya is a viral infection transmitted by Aedes mosquitoes, primarily Aedes aegypti and Aedes albopictus.
- Similar to malaria, the presence of Gambusia can reduce the mosquito population by feeding on their larvae, thereby controlling the spread of chikungunya.
- **Conclusion**: Gambusia can help control chikungunya.

4. **Option C: Ringworm**:
- Ringworm is a fungal infection caused by dermatophytes and is spread through direct skin contact or by contact with contaminated objects (fomites).
- It does not involve mosquitoes or their larvae in its transmission.
- **Conclusion**: Gambusia cannot control ringworm since it is not transmitted by mosquitoes.

5. **Option D: Dengue**:
- Dengue is also a viral infection transmitted by Aedes mosquitoes.
- Similar to malaria and chikungunya, introducing Gambusia can help reduce the mosquito population and control the spread of dengue.
- **Conclusion**: Gambusia can help control dengue.

### Final Answer:
The disease whose widespread infection cannot be controlled by the use of larvivorous fish like Gambusia is **C. Ringworm**.