Question

A natural form of passive immunity involves the transfer of ________.

A) IgA antibodies across the placenta
B) IgE antibodies by sneezing
C) IgG antibodies by kissing
D) IgA antibodies to an infant through the motherʹs milk
E) IgG antibodies to an infant through the motherʹs milk

Answer 1

Natural passive immunity involves the transfer of IgG antibodies from a mother to her child before and after birth. IgG antibodies are transferred via the placenta and provide passive immune defense for the infant. Secretory IgA can also be transferred through breast milk.

Step-by-step explanation:

Natural passive immunity involves the natural passage of IgG antibodies from a mother to her child before and after birth. Placental transfer of IgG is an important passive immune defense for the infant, lasting up to six months after birth. Secretory IgA can also be transferred from mother to infant through breast milk.