A subset of complex patients was selected for analysis using the live SARS-CoV-2 neutralization assay because of limited resources (n=201). Abbreviations: ELISA, enzyme-linked immunosorbent assay; ECLIA, electrochemiluminescence immunoassay; CLIA, chemiluminescence immunoassay; LFI, lateral flow immunoassay; N, nucleoprotein; RBD, receptor binding domain of the SARS-CoV-2 spike glycoprotein; S1/2, domain 1 or 2 of the SARS-CoV-2 spike glycoprotein; RBD+, extended receptor binding domain of the SARS-CoV-2 spike glycoprotein

Table 4: Diagnostic accuracy of an anti-S1 ELISA (IgG) for the presence of previous COVID-19 in various subgroups. Results of a diagnostic accuracy study are given (n=3’637).