Discussion
In a population, the probability of a susceptible individual getting infected with SARS-CoV-2 is low when a majority of individuals in the population becomes immune to this virus. This phenomenon is known as _______.
Answer: D
The phenomenon is herd immunity.
When most of a population is immune, through infection or vaccination, a pathogen finds too few susceptible hosts to keep spreading, so even the people who are not immune are indirectly protected. That population-level protection is herd (community) immunity.
Innate immunity is the non-specific first defence every individual has from birth. Adaptive immunity is the specific response of lymphocytes and antibodies within one person. Active immunity is adaptive immunity a person develops after their own exposure or vaccination. All three describe protection inside an individual, not the reduced risk to susceptible people in an immune population.
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