Significance(10) SARS-CoV-2(10) collected(10) objective(10) Result(10) COVID-19(9) aerosol(8) indicated(8) SARS-CoV-2 RNA(8) virus(8) Research(8) Viral RNA(8) Transmission(8) rRT-PCR(8) Surveillance(6) positive(6) risk(6) study period(6) Evidence(5) analyzed(5) Critical(5) provide(5) Support(5) VERO E6 cells(4) Epidemics(4) COVID-19 patient(4) infection risk(4) Contact(4) association(4) manuscript(4)