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herd immunity noun

  /ˈhəːd ɪˈmjuːnɪti/ , /ˈhɚd ɪˈmjunəti/ , [-ɾi]
  • (epidemiology) The indirect protection against the spread of a contagious disease in a given population caused by the immunity of a significant proportion of the population to that particular disease; the immunity may have been obtained through having survived the infection or through vaccination. [from early 20th c.]
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