Health
How the coronavirus spread from one member to 87% of 61 singers in chorus practice
David Williams CNN
Public health officials studying the outbreak of Covid-19 among members of the Washington Choir have found many ways the virus may have spread, According to a report issued by Centers for Disease Control and Prevention..
Authorities interviewed all 122 members Skagit Valley CorralI met every Tuesday for 2.5 hours before it happened. They focused on two rehearsals on March 3 and March 10 in Mount Vernon, Washington.
Reportedly, 53 became ill, 2 died, and all but one participated in both rehearsals. Reportedly, 33 cases were confirmed, with 20 potentially infected.
61 people participated in the March 10 rehearsal, one of whom reported having a cold-like illness. According to the report, the person tested positive for Covid-19 and was the first case identified by health authorities.
The person participated in both exercises, but did not begin to show symptoms until March 7.
County officials issued a social distance recommendation on March 10, but most probably weren’t aware of it yet. According to a statement from the Skagit County Public Health Department..
No one reported physical contact between practice attendees, but they were sitting close together. The chairs were reportedly 6-10 inches apart, but there were vacant seats among the members.
The choir was divided into two groups as part of the practice. They said members approached each other during the 45-minute session.
“The singing act itself may have contributed to the transmission of aerosol emissions affected by the loudness of vocalizations,” the report said. Some people, called super-emitters, also report that others emit more aerosol particles during speech than their colleagues.
There was also a 15-minute snack break with cookies and oranges. According to the report, members moved their chairs around the chair racks before and after the rehearsal.
“This is keeping at least 6 feet between people, avoiding group gatherings and crowded places, covering the face of cloth in public places where other social distance measurements are difficult to maintain during this pandemic. We emphasize the importance of physical distance, such as wearing. “
According to the report, participants developed symptoms between 1 and 12 days after practice on March 10.
According to the report, most of the singers were female (84%), with a median age of 69 years. Only 32% reported having an underlying disorder.
On March 15, the choir emailed members that some people were ill. Many were self-quarantining by the time health officials contacted them, and reports said this might have reduced further spread.
The study was conducted by the Skagit County Public Health Authority and was published in the weekly CDC Morbidity and Mortality Report.
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