Provided herein is a test system comprising severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) receptor binding domain (RBD) antigen, SARS-CoV-2 S2 antigen, and binding moieties that specifically bind to human IgG, human IgA, and human IgM. Also provided are methods of detecting SARS-CoV-2 antibodies in a sample using the test system.
SEROLOGICAL ASSAYS FOR SARS-COV-2