Which of these statements applies to active immunity
A)It is self-generated upon exposure to antigen.
B)It can be produced only as a result of a person actually having the disease.
C)It involves administration of preformed antibodies.
D)It is acquired in the newborn as a result of the transfer of antibodies across the placenta during intrauterine development.

Question

Quizplus · Accepted Answer

Active immunity is acquired when the immune system is activated by a pathogen, which leads to the production of specific antibodies and/or immune cells that can recognize and respond to that pathogen in the future. It can be self-generated upon exposure to an antigen, such as through vaccination or natural infection. Option B is incorrect because active immunity can be acquired through vaccination without actually having the disease. Option C refers to passive immunity, not active immunity. Option D refers to passive immunity that occurs when antibodies are transferred from the mother to the fetus during pregnancy, not active immunity.

Which of These Statements Applies to Active Immunity