1.5 Quantitative and dynamic detection of serum SARS-CoV-2 IgM and IgG specific antibodies in asymptomatic patients
Pharyngeal swabs were collected for SARS-CoV-2 nucleic acid tests until tests were negative for 3 consecutive times. Blood was collected from the first nucleic acid negative date (0 week) within weekly periods of: 1 week, 1-2 week, 2-3 week, and 6-7 week. Blood was centrifuged at 3000 rpm for 10 min. and sera were collected to detect levels of IgM and IgG specific antibodies quantitatively through chemiluminescence.