herd immunity

the immunity that occurs when an entire group of animals or people become immune to a particular infection, as with universal vaccination.
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American Heritage
Medical Dictionary

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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Example sentences
If herd immunity is the goal, then clearly we'd use this vaccine as much as
Large-scale vaccination of the population, called herd immunity, also provides
  an important defense against infectious disease.
And now vaccine resistance is spreading among parents who want to free ride on
  the herd immunity of others.
Being vaccinated against a disease protects everyone else through herd immunity.
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