Injection of antitoxin in tetanus confers which type of immunisation ?

Options

A. Active immunisation
B. Passive immunisation
C. Auto-immunisation
D. Humoral immunisation

Explanation

To determine the type of immunization conferred by the injection of antitoxin in tetanus, we can analyze the options provided and the nature of the antitoxin itself.

### Step-by-Step Solution:

1. **Understanding Tetanus**: Tetanus is caused by the bacterium *Clostridium tetani*, which produces a potent toxin. When a person is exposed to this toxin, it can lead to severe muscle spasms and can be life-threatening.

2. **Role of Antitoxin**: An antitoxin is a preparation that contains antibodies against a specific toxin. In the case of tetanus, the antitoxin is injected to neutralize the effects of the tetanus toxin.

3. **Types of Immunization**:
- **Active Immunization**: This involves the introduction of an antigen (inactivated or attenuated) into the body, which stimulates the immune system to produce its own antibodies. This process takes time to develop immunity.
- **Passive Immunization**: This involves the direct introduction of preformed antibodies into the body. This provides immediate protection but does not stimulate the body to produce its own antibodies. The immunity gained is temporary.

4. **Analyzing the Question**: Since the injection of antitoxin provides immediate protection by supplying preformed antibodies against the tetanus toxin, it falls under the category of passive immunization.

5. **Conclusion**: Therefore, the injection of antitoxin in tetanus confers **passive immunization**.

### Final Answer:
The injection of antitoxin in tetanus confers **passive immunization**.

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