A needle is used only for one injection in hospitals and clinics, after which it is disposed off. Which of these disease does this practice safeguard against us?

Options

A. Chickenpox
B. Hepatitis B
C. Dengue
D. Typhoid

Answer

To answer the question regarding which disease the practice of using a needle only for one injection safeguards against, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Practice**: In hospitals and clinics, needles are used only once for injections and then disposed of. This is done to prevent the reuse of needles, which can transmit infections.

2. **Identifying Diseases Transmitted by Needles**: Some diseases can be transmitted through blood and body fluids. When needles are reused, there is a risk of passing these diseases from one patient to another.

3. **Evaluating the Options**: The diseases listed in the question are:
- Chicken pox
- Hepatitis B
- Dengue
- Typhoid

4. **Analyzing Each Disease**:
- **Chicken Pox**: This is a viral infection that spreads through respiratory droplets, not through blood.
- **Hepatitis B**: This is a viral infection that is transmitted through contact with infectious body fluids, including blood.
- **Dengue**: This is transmitted by mosquitoes and does not involve blood-to-blood transmission through needles.
- **Typhoid**: This is caused by bacteria and is primarily spread through contaminated food and water, not through blood.

5. **Conclusion**: Among the diseases listed, Hepatitis B is the one that can be transmitted through contaminated needles. Therefore, the practice of using a needle only once and disposing of it helps safeguard against Hepatitis B.

### Final Answer:
The practice of using a needle only for one injection safeguards against Hepatitis B.