Table 1.
Reference standard | ||||||
---|---|---|---|---|---|---|
True positive | True negative | Sensitivity (%) | Specificity (%) | |||
RT–qPCR | Epidax® | Positive | 23 | 0 | 100 | 100 |
Negative | 0 | 20 | ||||
Bio–Rad | Positive | 23 | 0 | 100 | 100 | |
Negative | 0 | 20 | ||||
End-point RT–PCR | Epidax® - Cycle 45 | Positive | 40 | 0 | 100 | 100 |
Negative | 0 | 41 | ||||
Bio–Rad - Cycle 45 | Positive | 40 | 0 | 100 | 100 | |
Negative | 0 | 41 | ||||
Direct RT–qPCR | Epidax® | Positive | 23 | 0 | 96 | 100 |
Negative | 1 | 20 | ||||
Bio–Rad | Positive | 24 | 2 | 100 | 90 | |
Negative | 0 | 18 | ||||
Direct End-point RT–PCR | Epidax® - Cycle 45 | Positive | 23 | 1 | 96 | 95 |
Negative | 1 | 19 | ||||
Bio–Rad - Cycle 45 | Positive | 24 | 3 | 100 | 85 | |
Negative | 0 | 17 | ||||
RT-LAMP | Epidax® | Positive | 18 | 0 | – | 100 |
Negative | 12 | 24 | ||||
Proflex | Positive | 18 | 0 | – | 100 | |
Negative | 12 | 24 |
Note that the overall sensitivity of the RT-LAMP assay is not calculated due to the limited spread of Ct values of the positive samples available (as shown in Fig. 4a, b, there are two distinct groups of Ct values)