Changes

===Laboratory Tests===

===Laboratory Tests===

The most frequently used diagnostic tests are an ELISA and an indirect fluorescent antibody test. Both of these tests measure IgG antibodies against PRRS virus. Titers are detected within 7-10 days after infection and can persist for up to 144 days. High titers may indicate recent exposure, and viral shedding may be occurring within the sampled population. Tests for PRRS virus include PCR, virus isolation, and immunohistochemistry. Recently, nucleic acid sequencing of the open reading frame 5 region of the virus has become commercially available, and has proved to be an excellent tool for epidemiologic investigations in the field to confirm similarity between isolates recovered from different sites.

The most frequently used diagnostic tests are an ELISA and an indirect fluorescent antibody test. Both of these tests measure IgG antibodies against PRRS virus, which can be detected from 7-10 days post-infection. Titres persist for up to 144 days. High titers may indicate recent exposure, and viral shedding may be occurring within the sampled population.  

 

Tests for the PRRS virus itself also exist. These include PCR and virus isolation on clinical samples, and immunohistochemistry on tissues. Nucleic acid sequencing of the 5' end of the virus is commercially availabe ans is useful for comparing isolates recovered from different sites in order to facilitate epidemiological investigations.

==Pathology==

==Pathology==