Why Did the WHO Alter Its Definition of “Herd Immunity?”

Tara
3 min readDec 23, 2020
Photo by Viktor Forgacs on Unsplash

Herd Immunity. Even non-science types have a vague idea of what it means. Most of us realize it refers to the protection from viral infections when a large percentage of the population obtains immunity to it. A large immune population helps prevent the spread of the virus. But how is that immunity achieved?

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