Category: Everyday Science | Last updated: 2026-09-18

What epidemiological concept describes the indirect protection from an infectious disease that occurs when a sufficiently high percentage of a population is immune, thereby reducing the likelihood of infection for unvaccinated individuals?

A) Acquired Immunity
B) Passive Immunity
C) Herd Immunity
D) Innate Immunity

Explanation

Herd immunity, or community immunity, occurs when a large portion of a community becomes immune to a disease, making the spread of disease from person to person unlikely. This provides protection for those who are not immune.

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