Covid-19 spreads up to 15m at Aussie choir service - study

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A Covid-19 outbreak at a choir service in Australia is found to have spread to attendees up to 15m away from the index case, according to a case study of the outbreak.The study adds to the growing body of evidence that aerosols serve as a major route of transmission for the disease.According to the report, the outbreak took place at a church in Sydney last year.The index case started having Covid-19 symptoms on July 16 and sought to test the next day after learning he had been exposed to an infected person at an earlier event he attended on July 11. The test came back positive.In the 48 hours prior to the onset of symptoms, however, the chorist had performed on a piano and sang at four one-hour services - one each on July 15 and 16, and two on July 17.Further investigations tracked down 12 additional cases out of the 508 service attendees, five of whom attended the July 15 ser…