Immunity due to injection of diphtheria toxoid is an example of:

Options

A. naturally acquired active immunity
B. naturally acquired passive immunity
C. artificially acquired active immunity
D. artificially acquired passive immunity

Answer

To solve the question regarding the type of immunity due to the injection of diphtheria toxoid, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Immunity**:
- Immunity can be classified into two main categories: **natural** and **artificial**.
- Natural immunity occurs through natural processes, while artificial immunity is acquired through medical interventions.

2. **Differentiate Between Active and Passive Immunity**:
- **Active immunity** is when the body produces its own antibodies in response to an antigen.
- **Passive immunity** is when antibodies are transferred from another source, providing temporary protection.

3. **Identify the Nature of Diphtheria Toxoid Injection**:
- The diphtheria toxoid is a vaccine that contains inactivated toxins (antigens) from the diphtheria bacteria.
- The injection of this toxoid stimulates the immune system to produce its own antibodies against the diphtheria toxin.

4. **Classify the Immunity from Diphtheria Toxoid**:
- Since the diphtheria toxoid is administered through a vaccine, it falls under **artificially acquired** immunity.
- Because the body actively responds to the toxoid by producing antibodies, it is classified as **active immunity**.

5. **Conclusion**:
- Therefore, immunity due to the injection of diphtheria toxoid is an example of **artificially acquired active immunity**.

### Final Answer:
The correct answer is **artificially acquired active immunity**.

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