Table 2 Detection of swIAV in nasal swabs of piglets in study herds A-E by RT-qPCR at different weeks of age
|  | Age (week(s)) | Piglets sampled (n) | Herd tested PCR-positive (cq ≤ 35) | Herd tested PCR-negative |
|---|---|---|---|---|
Suckling piglets | 1 | 360 | None | A, B, C, D, E |
2 | 0 | – | – | |
3 | 60 | None | B | |
Weaned piglets | 4 | 69 | E | A |
5 | 252 | A, B, C, E | D | |
6 | 135 | A, B, E | None | |
7 | 140 | D | B, C | |
8 | 160 | A, C, E | B | |
9 | 134 | A, D | C | |
10 | 60 | A | C |