Transfusing a person with blood plasma proteins from a person or animal that has been actively immunised against a specific antigen provides

Options

A. active immunity
B. passive immunity
C. auto-immunity
D. anti-immunity

Answer

To solve the question regarding the transfusion of blood plasma proteins from an actively immunized person or animal, we need to analyze the options provided and understand the types of immunity involved.

### Step-by-Step Solution:

1. **Understanding the Question**: The question states that a person is receiving blood plasma proteins from someone who has been actively immunized against a specific antigen. Our task is to determine what this transfusion provides in terms of immunity.

2. **Identifying Types of Immunity**:
- **Active Immunity**: This occurs when a person is exposed to a pathogen and their immune system produces antibodies in response. This can happen naturally (through infection) or artificially (through vaccination).
- **Passive Immunity**: This involves the transfer of ready-made antibodies from one individual to another. This can occur naturally (e.g., antibodies passed from mother to child during breastfeeding) or artificially (e.g., through transfusion of immunized plasma).
- **Autoimmunity**: This is when the immune system mistakenly attacks the body's own healthy cells.
- **Anti-immunity**: This term is not standard in immunology and does not apply here.

3. **Analyzing the Options**:
- Given that the transfusion involves blood plasma proteins from an actively immunized source, the antibodies present in the plasma are already formed and ready to act against the specific antigen.
- This means that the recipient is receiving passive immunity, as they are not generating their own antibodies but rather receiving them from another source.

4. **Conclusion**: The correct answer to the question is that transfusing a person with blood plasma proteins from an actively immunized individual provides **passive immunity**.

### Final Answer:
Transfusing a person with blood plasma proteins from a person or animal that has been actively immunized against a specific antigen provides **passive immunity**.