The Curious Case of the Washington Choir

What you should know about super-spreaders

How did the choir get coronavirus?
William H. Calvin, a professor at University of Washington School of Medicine, analyzed how it was possible for 45 out of 60 members of a Washington choir to develop symptoms of Covid-19 when they were well spaced and taking precautions. Read more below.

Lessons from the Choir: The Science Behind Cloth Face Masks