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Presymptomatic transmission of COVID-19 in a cluster of cases occurred in confined space: a case report
COVID-19 is spreading rapidly intercity and international despite rigid public health prevention and control measures been taken. Case presentation: In a cluster of infection, six out of seven participants engaged in persistent singing and talking in confined space were later diagnosed COVID-19 patients. One of the cases was asymptomatic with no SARS-CoV-2 nucleic acid detected, but positive for anti-SARS-CoV-2 IgG. None of the household contacts was infected during the following month.doi:10.21203/rs.3.rs-18053/v1 fatcat:5dc7iy2o5vectmg34agmjdnlya