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Table 2 Descriptive statistics by frequency (N) and percentage (%) of PRRS serological diagnostic tests performed from 2007 to 2010

From: Spatial analysis and temporal trends of porcine reproductive and respiratory syndrome in Denmark from 2007 to 2010 based on laboratory submission data

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