Table 2.
Descriptive statistics by frequency (N) and percentage (%) of PRRS serological diagnostic tests performed from 2007 to 2010
| Year | 2007 | 2008 | 2009 | 2010 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Serological test | N | % | N | % | N | % | N | % | |
| Total number of serological tests performed | ELISA-type 1 | 101,925 | 44.1 | 100,172 | 44.2 | 95,133 | 44,7 | 94,493 | 45.2 |
| ELISA-type 2 | 101,924 | 44.1 | 100,174 | 44.2 | 95,133 | 44.7 | 94,495 | 45.2 | |
| IPMA-type 1 | 14,307 | 6.2 | 14,426 | 6.4 | 12,421 | 5.8 | 10,830 | 5.2 | |
| IPMA-type 2 | 12,804 | 5.5 | 11,775 | 5.2 | 10,225 | 4.8 | 9040 | 4.3 | |
| Total number of samples | 105,066 | - | 102,663 | - | 98,212 | - | 98,088 | - | |
| Number of samples only tested by: | ELISA-type 1 | 1 | <0.01 | 1 | <0.01 | 0 | 0.00 | 0 | 0.00 |
| ELISA-type 2 | 0 | 0.00 | 3 | <0.01 | 0 | 0.00 | 0 | 0.00 | |
| IPMA-type 1 | 783 | 0.8 | 605 | 0.6 | 1021 | 1.0 | 1095 | 1.1 | |
| IPMA-type 2 | 402 | 0.4 | 168 | 0.2 | 532 | 0.5 | 784 | 0.8 | |
| Number of samples tested by doubled ELISA | 89,529 | 85.2 | 87,156 | 84.9 | 84,569 | 86.1 | 85,659 | 87.3 | |
| Number of samples tested by ELISA and IPMA | 12,395 | 11.8 | 13,015 | 12.7 | 10,564 | 10.8 | 8837 | 9.0 | |