The herd immunity threshold is the percentage of a population that must be immune to a specific infectious disease in order to effectively stop its spread. Achieving this threshold protects those who are not immune, such as individuals who cannot be vaccinated due to medical reasons, by reducing the overall amount of the virus or bacteria circulating in the community. This concept is crucial in the development and implementation of vaccination programs, as it helps determine the level of vaccination coverage needed to protect public health.
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