antigens

What is Herd Immunity?

Herd immunity occurs when a significant portion of a population becomes immune to an infectious disease, either through vaccination or previous infection. This reduces the overall amount of pathogen transmission, providing indirect protection to those who are not immune. Antigens play a key role in achieving herd immunity, as they are the basis for vaccine-induced immunity. Monitoring antigenic profiles in a population helps epidemiologists assess herd immunity levels and make informed public health decisions.

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