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Which term refers to the threshold where enough members of a population have developed immune memory against a pathogen that infection transmission is dramatically restricted? Escape variant Hygiene hypothesis Attenuated virus Herd immunity

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Here, the word Herd Immunity is the point at which a population has formed immunological memory against a disease to the extent that infection transmission is severely constrained.

When a sizable fraction of a population (the herd) develops immunity to a disease, herd immunity occurs. When herd immunity is reached, the likelihood of disease transmission from one person to another decreases. As a result, everyone in the community is shielded from harm, not just the immune.

For instance, polio and smallpox 5 were formerly fairly prevalent in the United States, but thanks to mass immunization, they are now exceedingly uncommon. In actuality, polio has not existed in the United States since 1979. Herd immunity has been established thanks to the vaccines against these diseases.

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