Created at	Source	Raw Value	Validated value
Dec. 4, 2020, 12:45 a.m.	oms	1. Adult participants susceptible to be infected by SARS-CoV-19 (not previous infection) tested negative for IgM and IgG immunological test 2. No symptoms of COVID-19 3. Written informed consent signed by participating for the study	1. Adult participants susceptible to be infected by SARS-CoV-19 (not previous infection) tested negative for IgM and IgG immunological test 2. No symptoms of COVID-19 3. Written informed consent signed by participating for the study