Which of the following is used for passive immunization?

JODHPUR AIIMS SNO-2018

Applied Microbiology & Infection control

Easy

Appeared in: JODHPUR AIIMS SNO-2018

Explanation

Passive immunization is the process of providing an individual with pre-formed antibodies, rather than stimulating their own immune system to produce them.
Human and animal sera (containing immunoglobulins or antitoxins) are the biological products used to confer passive immunity.
This method provides immediate protection, which is crucial for post-exposure prophylaxis or to treat acute infections where the patient's immune system cannot respond quickly enough.
The protection offered by passive immunization is temporary, typically lasting a few weeks to months, as the transferred antibodies are eventually metabolized and not replaced by the body.

Option A: A killed vaccine contains inactivated pathogens that stimulate the body to produce its own antibodies. This is a form of active, not passive, immunity.
Option C: A toxoid is a modified bacterial toxin that has been made non-toxic but remains antigenic. It induces an active immune response against the toxin.
Option D: A live attenuated vaccine contains weakened pathogens that replicate in the host to induce a robust and long-lasting active immune response.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Principles of active versus passive immunization as background academic context rather than a clinical decision trigger.
Nurses must understand the difference to anticipate correct treatment. For a snakebite or a high-risk rabies exposure, passive immunization with antivenom or immunoglobulin is the immediate, life-saving priority.
Patient education is crucial. A patient receiving immunoglobulins must be taught that the protection is temporary and they may still need a vaccine series for long-term immunity.
What if? A patient with a deep, contaminated wound has an unknown tetanus vaccination history. The nurse should anticipate orders for both Tetanus Toxoid (for active immunity) and Tetanus Immunoglobulin (TIG) for passive immunity to provide immediate and long-term protection.

How to Approach the Question

First, identify the key term in the question: 'passive immunization'.
Recall the definition of passive immunization: receiving pre-formed antibodies, not making your own.
Analyze each option against this definition.
Killed vaccines, live vaccines, and toxoids all work by stimulating the body's immune system to 'actively' create antibodies. This process takes time.
Human and animal sera contain 'ready-made' antibodies (immunoglobulins) that are transferred to the recipient, providing 'passive' protection.
Therefore, sera are the correct choice for passive immunization.

Concept Tested & Keywords

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