The immunity that is transferred from maternal antibodies to the fetus trans-placentally and to the infant through breast milk to protect them until their own immune system matures to function is a kind of?

1. A

   Innate immunity

2. B

   Acquired immunity

3. C

   Active immunity

4. D

   Passive immunity

Appeared in: AIIMS Raipur NO - 2017 (Shift-1)

Explanation

• passive immunity, which is defined as the transfer of ready-made antibodies from one individual to another, providing immediate but temporary protection.
• This process occurs naturally when a mother passes antibodies to her child.
• Specifically, IgG antibodies are transferred across the placenta to the fetus, and IgA antibodies are transferred to the infant through breast milk.
• This protection is 'passive' because the infant's immune system does not actively produce these antibodies.
• The immunity wanes over several weeks to months as the transferred antibodies are naturally broken down.

Why Other Options Were Wrong

• Option A: Innate immunity is the body's non-specific, inborn defense system (e.g., skin, phagocytic cells). It does not involve the transfer of specific antibodies from another person.
• Option B: Acquired immunity is a broad category that includes both active and passive immunity. While the described immunity is a type of acquired immunity, 'Passive immunity' is the more specific and precise term.
• Option C: Active immunity is developed when an individual's own immune system produces antibodies in response to an antigen, such as through infection or vaccination. This is the opposite of receiving pre-formed antibodies.

Related Visual

• Visual 1: Diagram - A flowchart illustrating the classification of immunity into Innate and Acquired, with Acquired further branching into Active (Natural/Artificial) and Passive (Natural/Artificial). This would visually place the question's scenario under Natural Passive Immunity.
• Visual 2: Infographic - An image depicting a mother and baby, with arrows showing IgG crossing the placenta and IgA in breast milk, labeled as 'Natural Passive Immunity'.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Types of Immunity as background academic context rather than a clinical decision trigger.
• Nurses play a vital role in educating new mothers about the benefits of breastfeeding, including the transfer of protective antibodies that reduce the risk of infections in newborns.
• Understanding that passive immunity is temporary is crucial for patient education. Nurses must emphasize the importance of adhering to the recommended vaccination schedule to ensure the infant develops their own long-lasting (active) immunity as maternal antibodies decline.
• What if? If a mother is unable to breastfeed, the infant will still have protection from the IgG antibodies received via the placenta but will miss out on the additional mucosal protection provided by IgA in breast milk. This makes them more susceptible to respiratory and gastrointestinal infections, reinforcing the need for strict hygiene and timely vaccinations.

How to Approach the Question

• First, identify the core concept of the question, which is the mechanism of immunity being described.
• Analyze the keywords in the stem: 'transferred from maternal antibodies', 'trans-placentally', and 'through breast milk'. These keywords indicate that the protection is received, not self-made.
• Differentiate between the main types of immunity. Recall that 'active' immunity means the body actively produces antibodies, while 'passive' immunity means the body passively receives them.
• Based on the keyword 'transferred', you can immediately identify the process as a form of passive immunity.
• Eliminate 'Innate immunity' as it refers to non-specific, in-built defenses. Eliminate 'Active immunity' as it's the opposite of what's described.
• Choose 'Passive immunity' over the broader term 'Acquired immunity' because it is the most specific and accurate description of the scenario.

Concept Tested & Keywords

• Concept Tested: Types of Immunity
• Stem keywords: immunity, transferred, maternal antibodies, fetus, trans-placentally, infant, breast milk
• Lead-in keywords: is a kind of
• Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.

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QC6bIMTCtKcu_cmZU5lbgB

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