Immunity, herd

From WikiMD's Food, Medicine & Wellness Encyclopedia

immunity, herd.  the resistance of a group to invasion and spread of an infectious agent, based on the resistance to infection of a high proportion of individual members of the group. the resistance is a product of the number susceptible and the probability that those who are susceptible will come into contact with an infected person.

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Contributors: Prab R. Tumpati, MD