The Times - Serving Waitsburg, Dayton and the Touchet Valley

By Eric Umphrey
The Times 

What is herd immunity?


August 13, 2020

Herd immunity sometimes referred to as HIT for Herd Immunity Threshold, is the point at which a virus has more difficulty spreading because a significant amount of people have become immune. It is essential to know that once herd immunity is achieved, it does not mean a virus is gone, or everyone is immune at that point.

A simple way to think of it may be to think of a wildfire. When firefighters have stopped the fire from spreading, it is similar to having reached herd immunity in a pandemic. The fire is not out yet, and a danger of reignition exists until it is entirely extinguished. A ch...

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