(ChurchLeaders) Based on an extensive study of a COVID-19 outbreak in a chorale in Washington state, churches that reopen should use caution when it comes to choirs and even congregational singing. This week the CDC issued a report about disease transmission among the Skagit Valley Chorale, which held two-and-a-half-hour rehearsals in Mount Vernon on March 3 and March 10. An alarming 87 percent of members later became sick, and two died.