Question

What immunological component present in high concentrations in colostrum transfers natural passive immunity to the newborn?

Options

• IgE antibodies

• IgG antibodies

• IgM antibodies

• IgA antibodies

Answer 1

IgA antibodies are present in very high concentrations in colostrum and are responsible for transferring crucial natural passive immunity to the infant. This abundant IgA, along with other immune factors like lactoferrin and leukocytes in breast milk, protects the newborn from infections while their own immune system develops.