Table 3.
Serosurveillance of influenza A virus exposure in the Norwegian pig population between 2009 and 2017
| Immunogen/antigen | Homologous | Heterologous | |||
|---|---|---|---|---|---|
| 1 antigen | 2 antigens | 3 antigens | 4 antigens | Total | |
| H1N1pdm09 | 3,026 | 4,794 | 378 | 2 | 8,200 |
| swH1N1 | 13 | 4,771 | 378 | 2 | 5,164 |
| swH1N2 | 0 | 23 | 370 | 2 | 395 |
| swH3N2 | 0 | 2 | 8 | 2 | 12 |
| Total | 3,039 | 9,590 | 1134 | 8 | 13,711 |
A breakdown of pigs sera (n = 8,214 pigs) with the HAIT titre level ≥40 as cut-off threshold for showing homologous (single antigen) or heterologous multiple (2 to 4) antigenic reactions.