WBCS.LIVE practice question
Which antibody isotype is the most abundant in human colostrum (early breast milk), providing crucial passive immunity to infants?
Solve this multiple-choice question and check the correct answer with its explanation below.
Answer options
Correct answer and explanation
Correct answer: IgA
Explanation: ā Correct Answer: D) IgA š Explanation: Immunoglobulin A (IgA) is the principal antibody found heavily in mucosal secretions, including tears, saliva, and breast milk. Human colostrum is incredibly rich in secretory IgA, which safely coats the infant's gastrointestinal tract. This provides immediate, vital passive immunity against aggressive environmental pathogens before the baby's own immune system matures.