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COVID-19 Scan for May 13, 2020

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Choir practice in Washington state showed high COVID-19 attack rateIn a study yesterday in Morbidity and Mortality Weekly Report (MMWR), researchers describe a COVID-19 super-spreading event at a Washington state choir practice in March, which was attended by a symptomatic index patient and produced an attack rate of 53.3% to 86.7%.The choir practice, conducted on Mar 10, lasted 2.5 hours and was attended by 61 people, 32 of were eventually confirmed to have COVID-19 and 20 of whom were probable secondary cases.

Three patients were hospitalized, and two died. The index patient attended the practice with cold-like symptoms that had begun on Mar 7."The 2.5-hour singing practice provided several opportunities for droplet and fomite

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