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herd immunity
noun
- the immunity or resistance to a particular infection that occurs in a group of people or animals when a very high percentage of individuals have been vaccinated or previously exposed to the infection.
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Example Sentences
Since measles is so contagious, even with herd immunity, it can find a weak link and spread.
From The Daily Beast
Herd immunity protects those people, because diseases constantly need fresh victims.
From The Daily Beast
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