Table 2.
SARS-CoV-2 IgM/IgG antibodies detected using rapid serological tests and ELISA after urea dissociation in samples that had previously tested positive.
| Sample ID | Rapid test |
ELISA |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Before dissociation |
Urea 6M |
Before dissociation |
Urea 4M |
Urea 6M |
||||||
| IgM | IgG | IgM | IgG | IgM | IgG | IgM | IgG | IgM | IgG | |
| Sample 4 | + | – | + | – | + | – | – | nd | – | nd |
| Sample 5 | + | – | + | – | + | – | – | nd | – | nd |
| Sample 10 | + | – | – | – | – | + | nd | + | nd | + |
| Sample 11 | + | + | – | – | + | – | – | nd | – | nd |
| Sample 13 | + | – | – | – | + | – | – | nd | – | nd |
| Sample 15 | – | + | – | – | – | + | nd | + | nd | + |
| Sample 17 | + | + | – | – | – | + | nd | + | nd | + |
| Positive control 1 | – | + | – | + | – | + | nd | + | nd | – |
| Positive control 2 | – | + | – | + | – | + | nd | + | nd | + |
| Positive control 3 | – | + | – | + | – | + | nd | + | nd | + |
| Positive control 4 | – | + | – | + | – | + | nd | + | nd | + |
| Positive control 5 | + | + | – | + | + | + | + | + | + | + |
| Positive control 6 | + | + | – | + | – | + | nd | + | nd | – |
| Positive control 7 | + | + | + | + | + | + | + | + | – | + |
| Positive control 8 | – | + | – | + | – | + | nd | + | nd | – |
| Positive control 9 | – | + | – | + | – | + | nd | + | nd | + |
Abbreviations: IgM: Immunoglobulin M; IgG: Immunoglobulin G; nd.