Out of pneumonia, gangrene, yellow fever, dengue fever, malaria and elephantiasis, mosquitoes transmit diseases

Options

A. 6
B. 4
C. 3
D. 2

Answer

To determine which diseases among pneumonia, gangrene, yellow fever, dengue fever, malaria, and elephantiasis are transmitted by mosquitoes, we will analyze each disease one by one.

### Step-by-Step Solution:

1. **Pneumonia**:
- Pneumonia is primarily caused by bacteria, specifically *Streptococcus pneumoniae*.
- It is transmitted through respiratory droplets from an infected person (coughing or sneezing).
- **Conclusion**: Not transmitted by mosquitoes.

2. **Gangrene**:
- Gangrene occurs due to the loss of blood supply to a body part, often due to injury or infection.
- It is not caused by any vector but rather by conditions affecting blood flow.
- **Conclusion**: Not transmitted by mosquitoes.

3. **Yellow Fever**:
- Yellow fever is caused by a virus and is characterized by high fever and chills.
- It is transmitted by mosquitoes, specifically the *Aedes* mosquito.
- **Conclusion**: Transmitted by mosquitoes.

4. **Dengue Fever**:
- Dengue fever is caused by the dengue virus and is also characterized by high fever.
- It is transmitted by the *Aedes* mosquito.
- **Conclusion**: Transmitted by mosquitoes.

5. **Malaria**:
- Malaria is caused by the *Plasmodium* protozoa.
- It is transmitted by the female *Anopheles* mosquito.
- **Conclusion**: Transmitted by mosquitoes.

6. **Elephantiasis**:
- Elephantiasis, also known as lymphatic filariasis, is caused by the worm *Wuchereria bancrofti*.
- It is transmitted by the *Culex* mosquito.
- **Conclusion**: Transmitted by mosquitoes.

### Summary of Findings:
- Diseases transmitted by mosquitoes:
- Yellow Fever
- Dengue Fever
- Malaria
- Elephantiasis

- Diseases **not** transmitted by mosquitoes:
- Pneumonia
- Gangrene

### Final Answer:
Out of the six diseases listed, **four** are transmitted by mosquitoes: Yellow Fever, Dengue Fever, Malaria, and Elephantiasis.