A person who recovers from measles is immune to it for life. This is an example of
Correct answer: B. naturally active immunity
- A. artificially active immunity
- B. naturally active immunity
- C. naturally passive immunity
- D. artificially passive immunity
Explanation
The person's own immune system met the real pathogen and built memory, so the immunity is active and natural. Vaccination is active but artificial, and antiserum or maternal antibodies are passive.
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About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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