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herd immunity

the immunity or resistance to a particular infection that occurs in a group of people or animals when a very high percentage of individuals have been vaccinated or previously exposed to the infection. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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herd-immunity in Medicine

herd immunity n.

  1. Resistance to the spread of infectious disease in a group because susceptible members are few, making transmission from an infected member unlikely.

  2. The immunologic status of a population, determined by the ratio of resistant to susceptible members and their distribution.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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