Question:
Which antibody is most abundant in human colostrum (initial breast milk)?
Which antibody is most abundant in human colostrum (initial breast milk)?
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Remember the mnemonic: “A for Alimentary canal”. IgA mainly protects mucosal surfaces and is abundant in secretions like saliva, tears, and colostrum.
Updated On: Apr 22, 2026
- IgG
- IgM
- IgA
- IgE
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
Colostrum is the first milk produced by the mother immediately after childbirth.
It is rich in proteins, nutrients, and antibodies that provide passive immunity to the newborn.
The antibody most abundant in colostrum is Immunoglobulin A (IgA).
Step 1: Understand the role of colostrum. Colostrum protects the newborn from infections during the early days of life when the infant’s immune system is not fully developed.
Step 2: Identify the dominant antibody. The major antibody present in colostrum is secretory IgA (sIgA).
Step 3: Function of IgA. IgA mainly protects the mucosal surfaces of the body, such as:
• Digestive tract
• Respiratory tract
• Urogenital tract It prevents pathogens from attaching to mucosal cells and causing infection.
Step 4: Importance for the newborn. Through colostrum, IgA provides passive immunity, helping the newborn resist infections during early life.
Step 1: Understand the role of colostrum. Colostrum protects the newborn from infections during the early days of life when the infant’s immune system is not fully developed.
Step 2: Identify the dominant antibody. The major antibody present in colostrum is secretory IgA (sIgA).
Step 3: Function of IgA. IgA mainly protects the mucosal surfaces of the body, such as:
• Digestive tract
• Respiratory tract
• Urogenital tract It prevents pathogens from attaching to mucosal cells and causing infection.
Step 4: Importance for the newborn. Through colostrum, IgA provides passive immunity, helping the newborn resist infections during early life.
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