A definitive diagnostic evaluation of PRRS with respect to clinical disease requires that serological information be interpreted in combination with results from other virus assays.
PCR is expensive relative to other diagnostic methods.It should be kept in mind that a positive result on PCR indicates the presence of viral RNA and does not necessarily indicate the presence of infectious PRRSV.
Any tentative clinical diagnosis then should be confirmed by detection of PRRSV (infectious virus, viral antigens and/or viral genomic material) in affected pigs using laboratory methods in conjunction with typical lesions.
The cost of PRRS ranges from €17 to €185/sow/year in the three studies presented.
From 2000 to 2007 a PRRSv eradication plan was developed successfully in Chile. in October 2013 the spread of a new PRRS virus to several important Chilean pig companies was confirmed.
A lot of work needs to be done for controlling HP-PRRS completely. The implementation of proper regional control and eradication programs against PRRS is necessary in China and the Asian countries. Meanwhile, the increasing diversity of the PRRSV should be taken into consideration for developing more effective and safe vaccines.
A comprehensive picture of viral variation at the beginning of control and elimination projects is critical for effective monitoring of progress and effectiveness of implementation procedures, and for identification of new virus introductions to farms and to the region.