What concept describes the resistance of a group to a disease when a large proportion of its members are immune?

Herd immunity is the concept that explains how a significant portion of a population being immune to a disease can protect those who are not immune. When enough individuals are vaccinated or have recovered from an infection, the spread of the disease is limited because there are fewer hosts available for the pathogen to infect. This reduced transmission protects the vulnerable individuals, such as those who cannot be vaccinated due to medical reasons or other factors. Herd immunity is a critical public health strategy aimed at controlling infectious diseases and minimizing outbreaks, ultimately benefiting the entire community.

Population immunity refers more generally to the immune status of a population but does not capture the protective network effect that herd immunity describes. Collective resistance and community health, while important concepts in public health, do not specifically focus on the immunity and its implications for disease transmission.