Table 2. Avian influenza virus seroprevalence in poultry in the Netherlands, 2007–2009.
Total number of poultry farms sampled for antibody detection in time presented per month (A) and per year (B).
| A | ||||||||||||||
| Month | Chicken | Turkey | Duck | Mixed | Total | |||||||||
| Layer-indoor | Layer-outdoor | Broiler | ||||||||||||
| Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | |
| January | 217 | 0 (0) | 181 | 1 (0.6) | 277 | 0 (0) | 56 | 2 (3.6) | 36 | 0 (0) | 25 | 0 (0) | 792 | 3 (0.4) |
| February | 201 | 1 (0.5) | 160 | 0 (0) | 225 | 0 (0) | 52 | 1 (1.9) | 30 | 0 (0) | 27 | 0 (0) | 695 | 2 (0.3) |
| March | 261 | 0 (0) | 226 | 0 (0) | 180 | 0 (0) | 65 | 0 (0) | 15 | 0 (0) | 26 | 0 (0) | 773 | 0 (0) |
| April | 230 | 1 (0.4) | 170 | 0 (0) | 195 | 0 (0) | 49 | 0 (0) | 8 | 0 (0) | 18 | 0 (0) | 670 | 1 (0.1) |
| May | 233 | 1 (0.4) | 211 | 2 (0.9) | 299 | 0 (0) | 58 | 1 (1.7) | 6 | 0 (0) | 22 | 0 (0) | 829 | 4 (0.5) |
| June | 232 | 3 (1.3) | 288 | 2 (0.7) | 177 | 0 (0) | 49 | 0 (0) | 4 | 0 (0) | 29 | 1 (3.4) | 779 | 6 (0.8) |
| July | 181 | 0 (0) | 182 | 0 (0) | 292 | 0 (0) | 66 | 4 (6.1) | 3 | 0 (0) | 19 | 0 (0) | 743 | 4 0.5) |
| August | 160 | 0 (0) | 171 | 3 (1.8) | 164 | 0 (0) | 51 | 2 (3.9) | 6 | 1 (16.7) | 15 | 0 (0) | 567 | 6 (1.1) |
| September | 194 | 0 (0) | 209 | 0 (0) | 155 | 0 (0) | 53 | 2 (3.8) | 5 | 0 (0) | 17 | 0 (0) | 633 | 2 (0.3) |
| October | 157 | 0 (0) | 196 | 0 (0) | 165 | 0 (0) | 48 | 0 (0) | 5 | 1 (20.0) | 19 | 0 (0) | 590 | 1 (0.2) |
| November | 203 | 0 (0) | 209 | 0 (0) | 187 | 0 (0) | 49 | 0 (0) | 6 | 0 (0) | 23 | 2 (8.7) | 677 | 2 (0.3) |
| December | 225 | 1 (0.4) | 279 | 1 (0.4) | 159 | 0 (0) | 49 | 0 (0) | 34 | 1 (2.9) | 37 | 1 (2.7) | 783 | 4 (0.5) |
| Total | 2494 | 7 (0.3) | 2482 | 9 (0.4) | 2475 | 0 (0) | 645 | 12 (1.9) | 158 | 3 (1.9) | 277 | 4 (1.4) | 8531 | 35 (0.4) |
| B | ||||||||||||||
| Year | Chicken | Turkey | Duck | Mixed | Total | |||||||||
| Layer-indoor | Layer-outdoor | Broiler | ||||||||||||
| Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | Sampled | Antibody (%) | |
| 2007 | 903 | 3 (0.3) | 751 | 3 (0.4) | 761 | 0 (0.0) | 254 | 8 (3.1) | 51 | 1 (2.0) | 100 | 1 (1.0) | 2820 | 16 (0.6) |
| 2008 | 843 | 2 (0.2) | 889 | 1 (0.1) | 859 | 0 (0.0) | 214 | 1 (0.5) | 51 | 2 (3.9) | 90 | 2 (2.2) | 2946 | 8 (0.3) |
| 2009 | 748 | 2 (0.3) | 842 | 5 (0.6) | 855 | 0 (0.0) | 177 | 3 (1.7) | 56 | 0 (0.0) | 87 | 1 (1.1) | 2765 | 11 (0.4) |
| Total | 2494 | 7 (0.3) | 2482 | 9 (0.4) | 2475 | 0 (0.0) | 645 | 12 (1.9) | 158 | 3 (1.9) | 277 | 4 (1.4) | 8531 | 35 (0.4) |