More than 20 years after its emergence, porcine reproductive and respiratory syndrome (PPRS) is still having major impacts on the health and welfare of pigs and causing major economic losses worldwide. PRRS costs the USA pig industry about 600 dollarmillion a year - about a third of its infectious disease costs. No one has yet worked out how much PRRS costs Europe, but it will be a similarly substantial figure. Sweden faced its first outbreaks of PRRS in 2007. In Asia, the recent outbreak of'high fever' disease killed 400,000 of 2,120,000 infected pigs in four months in 10 eastern provinces of China. It has been attributed to new fatal variants in the PRRS virus, is still not under control and it is reported to have spread to Vietnam.
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