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.
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.
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