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1. Oxford American Dictionary

   herd immunity

   • n.
     resistance to the spread of an infectious disease within a population that is based on pre-existing immunity of a high proportion of individuals as a result of previous infection or vaccination

   • noun: herd immunity, plural noun: herd immunities

2. • 釋義

   n.

   名詞

   • 1. resistance to the spread of an infectious disease within a population that is based on pre-existing immunity of a high proportion of individuals as a result of previous infection or vaccination the level of vaccination needed to achieve herd immunity varies by disease but ranges from 83 to 94 percent