Table 1.
Serological assays used and their commercial information.
| Assay | Qualitative/Quantitative | Antibody component measured | Index Value | Manufacturer |
|---|---|---|---|---|
| AllTest COVID-19 IgG Rapid Test Cassette | Qualitative | IgG | No | Hangzhou Alltest Biotech, Hangzhou, China |
| Architect SARS-CoV-2 IgG | Qualitative | IgG(target: nucleocapsid protein) | Yes;S/C ≥ 1.40 considered positive | Abbott Laboratories, Chicago, USA |
| cPass Surrogate Virus Neutralization Test (sVNT) Kit | Quantitative | Neutralizing antibodies | Yes;% inhibition | GenScript Biotech, Piscataway, USA |
| Elecsys Anti-SARS-CoV-2 | Qualitative | Total (IgM+IgG)(target: nucleocapsid protein) | Yes;COI ≥1.0 considered positive | Roche, Basel, Switzerland |
| Elecsys Anti-SARS-CoV-2 S | Quantitative | Total(IgM+IgG)(target: spike protein) | Yes; ≥ 0.8 U/mL reactive | Roche, Basel, Switzerland |
| Liaison SARS-CoV-2 S1/S2 IgG | Qualitative | IgG(target: spike protein) | Yes;≥15.0 AU/mL considered positive. | Diasorin, Saluggia, Italy |
| Standard Q COVID-19 IgM/IgG Combo | Qualitative | IgM + IgG | No | SD Biosensor, Suwon-si, South Kora |
| Wantai SARS-COV-2 Ab ELISA | Qualitative | Total (IgM+IgG) | Yes;A/CO ≥1.0 considered positive. | Beijing Wantai Biological, Beijing, China |
Abbreviations: A/CO – absorbance over cut-off; AU/mL – arbitrary units per mL; COI – cut-off index; S/C – signal/cut-off; U/mL – units per mL.