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ExamsNEETBiology

Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the newborn infants because it contains:

  1. Natural killer cells
  2. Monocytes
  3. Macrophages
  4. Immunoglobulin A

Correct answer: Immunoglobulin A

Solution

Colostrum is rich in secretory IgA, which coats the infant’s gut and helps block pathogens from attaching and invading. This gives the newborn passive immunity during the early days before its own immune system is fully developed.

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