Which statement is true regarding how infants acquire immunity? ...

[Hungry!]

Which statement is true regarding how infants acquire immunity?
 
  a. The infant acquires humoral and cell-mediated immunity in response to infections and immunizations.
  b. The infant acquires maternal antibodies that ensure immunity up to 12 months of age.
  c. Active immunity is acquired from the mother and lasts 6 to 7 months.
  d. Passive immunity develops in response to immunizations.

Question 2

A nurse is teaching parents about the importance of immunizations for infants because of immaturity of the immune system. The parents demonstrate that they understand the teaching if they make which statement?
 
  a. The spleen reaches full size by 1 year of age..
  b. IgM, IgE, and IgD levels are high at birth..
  c. IgG levels in the newborn infant are low at birth..
  d. Absolute lymphocyte counts reach a peak during the first year..

[covalentbond]

Answer to Question 1

A
Infants acquire long-term active immunity from exposure to antigens and vaccines. Immunity is acquired actively and passively. The term infant's passive immunity is acquired from the mother and begins to dissipate during the first 6 to 8 months of life. Active immunity develops in response to immunizations.

Answer to Question 2

D
Absolute lymphocyte counts reach a peak during the first year. The spleen reaches its full size during adulthood. IgM, IgE, and IgD are normally in low concentration at birth. IgM, IgE, IgA, and IgD do not cross the placenta. The term newborn infant receives an adult level of IgG as a result of transplacental transfer from the mother.