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MENTAL MODEL · M0749

Herd Immunity

Herd Immunity
SystemsHigh supportSystems Theory
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

When a sufficiently high proportion of individuals in a group have immunity to an infectious disease (through vaccination or infection), the virus has difficulty spreading between individuals, thereby protecting those who are not immune.

SCAFFOLDING EFFECT

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Understanding systemic protection. It shows that protecting the vulnerable (e.g., those who cannot be vaccinated) is not only an individual responsibility but also a collective one. In corporate culture, when enough people adhere to positive values, an 'immunity' can also form, preventing the spread of negative practices.

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When a sufficient proportion of individuals are immune, the transmission chain is interrupted, thereby protecting the non-immune. The threshold is approximately 1 minus 1 divided by the basic reproduction number.

MINIMUM ACTION

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Source support: Explicit

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    zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E7%BE%A4%E4%BD%93%E5%85%8D%E7%96%ABZH · Explicit
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