For the detection and qualitative measurement of IgG class antibodies against the spike protein S1 receptor-binding domain (S1RBD) of SARS-CoV-2 virus in human blood. For research use only, not for use in diagnostic procedures. This tool interprets the provided measurement results in accordance with BioVendor's Human Anti-SARS-CoV-2 S1RBD IgG ELISA Kit (RAI009R).