Question

After birth, infant receives antibodies IgA through colostrum from mother. This is an example of ______________ immunity.

• A. natural acquired active
• B. innate (natural)
• C. artificial acquired passive
• D. natural acquired passive

Hint:

Passive immunity provides immediate protection but is short-lived.

Answer 1

The Correct Option is D

Step 1: Understanding antibody transfer.
Colostrum is the first milk produced by the mother and is rich in antibodies, especially IgA.
Step 2: Nature of immunity.
The infant does not produce these antibodies; instead, they are transferred directly from the mother.
Step 3: Classification of immunity.
Since antibodies are received naturally and passively, this immunity is termed natural acquired passive immunity.
Step 4: Conclusion.
Thus, IgA transfer through colostrum is an example of natural acquired passive immunity.