Table. Number of swabs and number and percentage of influenza-positive specimens tested by sentinel systems, before and after the COVID-19 pandemic, Spain, seasons 2014/2015 to 2020/2021.
| Season | PC - influenza sentinel surveillance system (w40–w20) |
PC- ARI surveillance (w40–w38) |
Hospital- SARI surveillance (w40–w38) |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Specimens (n) | Influenza detections (n) | Positivity (%) | Specimens (n) | Influenza detections (n) | Positivity (%) | Specimens (n) | Influenza detections (n) | Positivity (%) | |
| 2014/15 | 5,101 | 2,779 | 54.48 | NA | NA | NA | NA | NA | NA |
| 2015/16 | 5,308 | 2,715 | 51,15 | ||||||
| 2016/17 | 4,479 | 2,140 | 47.78 | ||||||
| 2017/18 | 6,035 | 3,509 | 58.14 | ||||||
| 2018/19 | 4,974 | 2,562 | 51.51 | ||||||
| 2019/20 | 4,799 | 2,579 | 53.74 | ||||||
| 2020/21 | NA | NA | NA | 4,753 | 2 | 0.04 | 6,429 | 1 | 0.02 |
ARI: acute respiratory infection; COVID-19: coronavirus disease; NA: not applicable; n: number; PC: primary care; SARI: severe acute respiratory infection; w: week.