First outbreak of PRRS was reported in the United States in 1987, in Europe it started to spread in 1990 in Germany (1). Porcine reproductive and respiratory syndrome virus (PRRSV) infection is world-wide distributed. PRRSV is plague in swine industry and cause economically important reproductive and respiratory problems. Serologically positive herds without economically significant losses complicates PRRS control (2, 6).
Immuno Peroxidase Machrophage Assay (IPMA) and ELISA are used for serological diagnosis for PRRS (5).
Pig production in Slovenia is under systematic monitoring and control for many important diseases. One of it is also porcine reproductive and respiratory syndrome. The monitoring and control are part of annual Order of Ministry of Agriculture, forestry and food of Slovenia. Testing for PRRS is obligatory and free of charge for pig producers (3). Important measure in PRRS control is quarantine. Pigs with antibodies against PRRSV can not be imported in Slovenia (4).
In our laboratory we used commercial ELISA for detection of antibodies against PRRSV. Monitoring has started 1995 and include representative sample of breeding pigs from large and small farms in Slovenia. Typical outbreak of PRRS was never observed in Slovenia.