Table 2.
Agreement between the antigen tests (AGT) and RT-PCR, false negative and false positive samples out of the total number of positive/negative samples according to the particular reference method (RT-PCR or RT-PCR + virus viability).
| Ecotest | JoysBio | ND COVID | Standard Q | VivaDiag | ||
|---|---|---|---|---|---|---|
| AGT and RT-PCR Agreement/Total |
285/318 (90%) | 185/225 (82%) | 118/191 (61%) | 122/139 (88%) | 208/268 (78%) | |
| AGT False Negatives | vs. RT-PCR | 26/107 (24%) | 38/90 (42%) | 23/77 (30%) | 16/42 (38%) | 53/91 (58%) |
| vs. RT-PCR +viability | 3/84 (4%) | 4/56 (7%) | 8/62 (13%) | 4/30 (13%) | 9/47 (19%) | |
| Viable virus presence * | 3/26 (12%) | 4/38 (11%) | 8/23 (35%) | 4/16 (25%) | 9/53 (17%) | |
| AGT False Positives | vs. RT-PCR | 7/211 (3%) | 2/135 (1%) | 50/114 (44%) | 1/97 (1%) | 7/177 (4%) |
| vs. RT-PCR + viability | 7/234 (3%) | 2/169 (1%) | 50/129 (39%) | 1/109 (1%) | 7/221 (3%) | |
* Samples containing viable virus out of false-negative AGT results when compared to RT-PCR only.