A 2 1/2 hour choir rehearsal in early March was deemed the cause of a fatal coronavirus outbreak in one church in Washington state.

Sixty members of the Skagit Valley Chorale gathered together in Mount Vernon Presbyterian Church for their standard rehearsal on March 10. The group was aware of a few cases of coronavirus in the state, including the nation’s first COVID-19 death on Feb. 29. Still, they agreed to meet.