When an infectious disease cannot spread in a population because it lacks a significant number of susceptible hosts,the phenomenon is referred to as

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Herd immunity refers to the protection of a population against an infectious disease when a large proportion of individuals in that population are immune (either through vaccination or previous infection), preventing the disease from spreading and reducing the number of susceptible hosts. As a result, even those individuals who are not immune (e.g. due to inability to receive the vaccine) are indirectly protected due to the decreased likelihood of disease transmission.

When an Infectious Disease Cannot Spread in a Population Because