herd immunity
noun/ˌhɜːd ɪˈmjuːnəti/
/ˌhɜːrd ɪˈmjuːnəti/
[uncountable]- protection from a disease that happens if a large percentage of the population is immune to it (= unable to catch it, for example because they have been vaccinated)
- Herd immunity can be achieved if 95% of children are vaccinated.
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herd immunity