Question

Which of the following is an example of active acquired immunity?

• A. Nursing mother transfers some antibodies to infant through colostrum (breast milk)
• B. Person recovered from measles does not get measles again
• C. Injection of anti tetanus is given after injury
• D. We do not suffer from distemper, a fatal canine disease

Answer 1

Answer: (B)

Person recovered from measles does not get measles again

Active acquired immunity is developed due to the formation of the antibodies against a particular antigen due to the first encounter. When the organism attacks once, the antibodies are produced and remembered by the memory cells. This provides protection on the second encounter of the same disease. When the person recovers once from measles, the person is not affected by measles again.

Thus, the correct answer is option B.