Table 1 Detection of influenza A virus by real-time reverse transcription polymerase chain reaction (rRT-PCR) by sample and farm type
Farm type | Farm ID | Farm status | Nasal swab (%) | Nasal wipe (%) | Oropharyngeal swab (%) | Oral fluid (%) | Surface wipe (%) | Udder wipe (%) | Airborne particle deposition (%) | Air (%) |
|---|---|---|---|---|---|---|---|---|---|---|
Sow herd | 1 | POS | 8/10* (80) | 7/10 (70) | 10/10 (100) | 3/3 (100) | 9/10 (90) | 10/10 (100) | 10/10 (100) | 10/10 (100) |
2 | POS | 7/10 (70) | 6/10 (60) | 9/10 (90) | 1/1 (100) | 7/10 (70) | 9/10 (90) | 10/10 (100) | 10/10 (100) | |
3 | NEG | 0/10 (0) | 0/10 (0) | 0/10 (0) | 0/3 (0) | 0/10 (0) | 0/10 (0) | 0/10 (0) | 0/10 (0) | |
4 | POS | 2/10 (20) | 3/10 (30) | 4/10 (40) | 1/2 (50) | 3/10 (30) | 5/10 (50) | 5/10 (50) | 10/10 (100) | |
5 | POS | 5/10 (50) | 5/10 (50) | 8/10 (80) | 1/1 (100) | 5/10 (50) | 7/10 (70) | 10/10 (100) | 10/10 (100) | |
6 | NEG | 0/10 (0) | 0/10 (0) | 0/10 (0) | 0/1 (0) | 0/10 (0) | 0/10 (0) | 0/10 (0) | 0/10 (0) | |
Total& | – | 22/40 (55)a | 21/40 (53)a | 31/40 (78)a | 6/7 (86)x | 24/40 (60)x | 31/40 (78)x | 35/40 (88)z | 40/40 (100)z | |
Wean-to-finish | 1 | NEG | 0/10 (0) | 0/10 (0) | NC** | 0/10 (0) | 0/10 (0) | NC | 0/10 (0) | 0/10 (0) |
2 | POS | 6/10 (60) | 6/10 (60) | NC | 4/10 (40) | 3/10 (30) | NC | 0/10 (0) | 1/10 (10) | |
3 | POS | 2/10 (20) | 2/10 (20) | NC | 10/10 (100) | 5/10 (50) | NC | 9/10 (90) | 10/10 (100) | |
4 | POS | 4/10 (40) | 4/10 (40) | NC | 5/10 (50) | 5/10 (50) | NC | 7/10 (70) | 6/7 (85.7) | |
5 | POS | 2/10 (20) | 3/10 (30) | NC | 7/8 (87.5) | 10/10 (100) | NC | 9/10 (90) | 10/10 (100) | |
6 | POS | 1/10 (10) | 1/10 (10) | NC | 4/10 (40) | 2/10 (20) | NC | 4/10 (40) | 4/10 (40) | |
Total& | – | 15/50 (30)a | 16/50 (32)a | NC | 30/48(62.5)x | 25/50 (50)x | NC | 29/50 (58)z | 31/47 (65.9)z |