Which type of immunity is at work when Hepatitis Immunoglobulin is given to a woman for the prevention of hep… - AIIMS Rishikesh NO - 2019

AIIMS Rishikesh NO - 2019

Microbiology

Hard

Appeared in: AIIMS Rishikesh NO - 2019

Explanation

Passive acquired immunity is provided when a person receives ready-made antibodies from an external source, rather than producing them through their own immune system.
Hepatitis B Immunoglobulin (HBIG) is a concentrated solution of antibodies collected from donors with high levels of antibodies against the hepatitis B virus.
Administering HBIG provides immediate but temporary protection by directly giving the body the tools to fight the virus, bypassing the need for an active immune response.
This is a form of artificial passive immunization, used for post-exposure prophylaxis to prevent infection after a known or likely exposure.

Option A: Active natural immunity develops after a person is exposed to a pathogen and recovers from the illness. The body actively produces its own antibodies, leading to long-term memory. This is not what happens when a person receives an immunoglobulin injection.
Option C: An antigen is any substance that the immune system recognizes as foreign and that can trigger an immune response (e.g., a virus, bacterium, or toxin). It is the stimulus for an immune response, not a type of immunity itself.
Option D: Active acquired immunity is induced by vaccination. A vaccine introduces a weakened or inactivated antigen, prompting the body to actively produce its own antibodies and memory cells for long-term protection. HBIG provides antibodies directly, it does not stimulate production.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Types of Immunity: Active vs. Passive and Natural vs. Acquired as background academic context rather than a clinical decision trigger.
Understanding the difference between active and passive immunity is crucial for nurses, especially in post-exposure prophylaxis (e.g., after a needlestick injury with a contaminated needle) and for newborn care.
Nurses must educate patients that passive immunity from HBIG is immediate but temporary. The Hepatitis B vaccine series is still required to develop long-term (active) protection.
HBIG is often administered concurrently with the first dose of the Hepatitis B vaccine at a different injection site to provide both immediate passive and long-term active immunity.

How to Approach the Question

First, identify the key substance administered in the question: 'Hepatitis Immunoglobulin'.
Recall or deduce the function of an 'immunoglobulin'. It is a preparation of antibodies.
Analyze the core concept: Is the body making its own antibodies (active) or receiving them ready-made (passive)?
Since immunoglobulins are ready-made antibodies, the process is 'passive'.
Next, determine if the immunity is 'natural' (e.g., mother to baby) or 'acquired' (from an external medical intervention). Since it's an injection, it is 'acquired'.
Combine these concepts to identify 'Passive acquired immunity' as the correct answer and eliminate the 'active' options.

Concept Tested & Keywords

Concept Tested: Types of Immunity: Active vs. Passive and Natural vs. Acquired
Stem keywords: Hepatitis Immunoglobulin, prevention of hepatitis B, type of immunity
Lead-in keywords: Which type
Negative lead-in flag: false

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