Active immunity is the induction of immunity after exposure to an antigen. Antibodies are created by the recipient and may be stored permanently due to the activation of memory cells which recognizes the same antigen in future and destroy them. Active immunity can occur naturally when a microbe or other antigen is received by a person who has not yet come into contact with the microbe and has no pre-made antibodies for defence. The immune system will eventually create antibodies for the microbe, but this is a slow process.
So, the correct answer is 'Memory cells'.
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Q1
Active immunity is due to
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Q2
Helper T cells activate virtually all the other immune system cells after foreign virus has entered the body.
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Q3
Distinguish between the following:, (a) cell-mediated immunity and humoral immunity, (b) active and passive immunization