Table 2.
Performance of a point-of-care test for influenza in nasal and throat swabs compared to RT-PCR stratified for CT value of PCR resulta
| Virus and POC test result | No. of samples with the following CT value: |
P | |||
|---|---|---|---|---|---|
| 0–25 | 25–30 | 30–35 | 35 or higher | ||
| Influenza A virus | |||||
| Nasal pos | 32 | 18 | 6 | 4 | |
| Nasal neg | 0 | 1 | 11 | 9 | <0.0001 |
| Throat pos | 12 | 21 | 7 | 1 | |
| Throat neg | 0 | 8 | 10 | 16 | <0.0001 |
| Influenza B virus | |||||
| Nasal pos | 38 | 16 | 3 | 0 | |
| Nasal neg | 4 | 10 | 6 | 1 | 0.0004 |
| Throat pos | 20 | 8 | 5 | 0 | |
| Throat neg | 11 | 14 | 8 | 1 | 0.03 |
a
Numbers of samples with a positive RT-PCR result are displayed per range of CT values with the corresponding numbers of positive and negative POC test results and the P value of that association. Nasal, nasal swab specimen; throat, throat swab specimen; pos, positive; neg, negative.