HERD IMMUNITY 2)4)
The resistance to propagation of a contagious process in a composite system when the contagious element is insufficiently numerous.
C. WILLS writes: "If most of a herd is immunised against a disease, that disease can no longer spread easily, and the few unimmunised animals are also protected" (1996, p.41).
In more general terms, avalanches and other percolation effects in composite systems occur only if a critical density threshold of the perturbating elements is crossed.
Herd immunity is related to the degree of diversity of elements or evenness in the defined space.
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Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]
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