The Latest Science on Herd Immunity and Covid-19

Here’s what experts say

What is herd immunity?

As Tara Haelle reports for Elemental, “the basic concept of herd immunity is pretty straightforward: The more people in a population who are immune to a disease, the harder it is for that disease to spread through the community. For example, if none of the 1,000 residents in a small town were immune to measles and someone sick with measles visited, about 900 townspeople would likely end up with measles — the disease would rage through the town…