When a large proportion of a population is vaccinated, even unvaccinated individuals are protected because the pathogen cannot spread easily. This is called
Correct answer: C. herd immunity
- A. cross immunity
- B. passive immunity
- C. herd immunity
- D. autoimmunity
Explanation
Vaccinated people act as dead ends for transmission, shielding those too young or too ill to be vaccinated. Herd immunity is the public health reason vaccination coverage matters beyond the individual.
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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.
Practise Immunity
139 free Immunity MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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