Will we ever reach herd immunity to Covid? | Erin Mordecai and Mallory Harris

Access to vaccines, masks and tests will help us make the awkward transition from pandemic to endemic

In May 2020, we and other scientists predicted that many regions of the world might never reach the herd immunity threshold for Covid-19 - the point at which enough people are immune to infection that transmission begins to slow down.

This remains true today, even as vaccines have become accessible in wealthy nations and many people have built up immunity through vaccinations, boosters and previous infections.

Erin Mordecai is an associate professor of biology at Stanford University. Mallory Harris is a PhD candidate at Stanford University, where she studies infectious disease