Materials
Three antibody tests were performed: Standard Q COVID-19 IgM/IgG Combo
rapid test (SD Biosensor Inc, Suwon, Gyeonggi, Republic of Korea),
Platelia SARS-CoV-2 Total Ab (IgM/IgG/IgA) Assay (Bio-Rad Laboratories
Inc, California, USA), and Wantai Total Ab (IgM/IgG/IgA) ELISA for
SARS-CoV-2 (Wantai Biological Pharmacy Enterprise Co. Ltd, Beijing,
China).