herd immunity
US /hɝd ɪˈmjuː.nə.t̬i/
UK /hɝd ɪˈmjuː.nə.t̬i/
1.
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.
:
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Achieving herd immunity through vaccination is crucial to control the pandemic.
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Some diseases require a very high percentage of the population to be immune to achieve effective herd immunity.