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Herd im·mu·ni·ty

noun
- 1. resistance to the spread of an infectious disease within a population that is based on pre-existing immunity of a high proportion of individuals as a result of previous infection or vaccination: "the level of vaccination needed to achieve herd immunity varies by disease but ranges from 83 to 94 percent"
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Herd immunity
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Protection from infectious disease that occurs when a sufficient fraction of a population has become immune
Herd immunity (also called herd effect, community immunity, population immunity, or mass immunity) is a form of indirect protection that applies only to contagious diseases. It occurs when a sufficient percentage of a population has become immune to an infection, whether through previous infections or vaccination, thereby reducing the likelihood of infection for individuals who lack immunity. Wikipedia
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