Question

All of the following statements are correct about active immunity, except

• A. it is slow and takes time to give its full effective response.
• B. memory cells are formed.
• C. antibodies are not formed during primary response.
• D. exposure of antigen is a pre-requisite for the development of active immunity.

Answer 1

Answer: (C)

It is developed when a host is exposed to antigens (living or dead microbes/proteins) and antibodies are produced in the host body (both in primary and secondary immune response). Active immunity is slow and takes time to give its full effective response. It can be developed by injecting the microbes or by the natural entry of infectious organisms into the body.
Example: During Vaccination and Immunisation.