Table 3. Comparison of COVID-19 positivity obtained by Real time RT-PCR multiplex for SARS-CoV-2 using GAPDH as internal control from two RNA extraction methods in six epidemiological weeks, four using commercial kits (EW 21, 22, 28 and 29) and two using proteinase k treatment followed by thermal shock (EW 24 and 25).
| Epidemiological week | Samples processed | Positive (n) | Positivity (%) | Average (%) | SD |
|---|---|---|---|---|---|
| 21 | 17,212 | 5,275 | 30.65 | 31.59 | 1.329361 |
| 22 | 20,287 | 6,599 | 32.53 | ||
| 24 | 26,160 | 8,042 | 30.74 | 30.955 | 0.304056 |
| 25 | 23,238 | 7,243 | 31.17 | ||
| 28 | 25,134 | 8,343 | 33.19 | 32.8 | 0.551543 |
| 29 | 36,365 | 11,787 | 32.41 | ||
| Total | 148,396 | 47,289 | 31.78 |