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 but ranges from 83 to 94 percent
More example sentences
- The goal of measles control is to raise population immunity above herd immunity threshold and eventually to interrupt indigenous virus transmission.
- The goal is herd immunity, where the proportion of people susceptible to infection in a physically interacting population is so low that transmission of infection is unlikely.
- As adolescents are the only group in which carriage rates have been studied, these data provide more robust evidence of herd immunity across the whole population.
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