It was a chilly evening in Mount Vernon, Wash., on March 10, when a group of singers met for choir practice at their church, just as they did most Tuesday nights.
The full choir consists of 122 singers, but only 61 made it that night, including one who had been fighting cold-like symptoms for a few days.
That person later tested positive for the coronavirus, and within two days of the practice, six more members of the choir had developed a fever. Ultimately, 53 members of the choir became ill with Covid-19, the disease caused by the virus, and two of them died.
A study since then has showed that swift action by the