Table 1.
Performance comparison of the ID NOW COVID-19 assay and a laboratory developed rRT-PCR assay to detect SARS-CoV-2 from paired or re-used ID NOW swabs.
| Swab type | rRT-PCR | PPA (95% CI) | NPA (95% CI) | |
|---|---|---|---|---|
| Positive | Negative | |||
| ID NOW (Paired ID NOW and MMM swabs) | ||||
| Anterior nasal swab (n = 28) | ||||
| Positive | 6 | 0 | 100.0% | 100.0% |
| Negative | 0 | 22 | (0.61–1.0) | (0.85–1.0) |
| Midturbinate swab (n = 223) | ||||
| Positive | 18 | 1 | 94.7% | 99.5% |
| Negative | 1 | 203 | (0.75–0.99) | (0.97–0.99) |
| Nasopharyngeal swab (n = 92) | ||||
| Positive | 16 | 0 | 76.2% | 100.0% |
| Negative | 5 | 71 | (0.54–0.89) | (0.95–1.0) |
| Overall (n = 343) | ||||
| Positive | 40 | 1 | 86.9% | 99.7% |
| Negative | 6 | 296 | (0.74–0.94) | (0.98–0.99) |
| ID NOW (Re-used ID NOW swab in MMM) | ||||
| Anterior nasal swab (n = 28) | ||||
| Positive | 6 | 0 | 100.0% | 100.0% |
| Negative | 0 | 22 | (0.61–1.0) | (0.85–1.0) |
| Midturbinate swab (n = 223) | ||||
| Positive | 18 | 1 | 90.0% | 99.5% |
| Negative | 2 | 202 | (0.69–0.98) | (0.97–0.99) |
| Nasopharyngeal swab (n = 92) | ||||
| Positive | 16 | 0 | 84.2% | 100.0% |
| Negative | 3 | 73 | (0.68–0.94) | (0.95–1.0) |
| Overall (n = 343) | ||||
| Positive | 40 | 1 | 88.8% | 99.7% |
| Negative | 5 | 297 | (0.76–0.95) | (0.98–0.99) |