Definition of herd immunity in English:

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herd immunity


[mass noun]
The resistance to the spread of a contagious disease within a population that results if a sufficiently high proportion of individuals are immune to the disease, especially through vaccination: the level of vaccination needed to achieve herd immunity varies by disease
More example sentences
  • The result has been outbreaks of measles - children have received ineffective injections leading to a breakdown in herd immunity.
  • Uncertainty about the level of herd immunity generated by vaccination programmes limits modelling of the potential benefits of booster vaccination.
  • High immunisation rates may result in herd immunity, which increases protection for all residents, including the weakest patients.
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