Porcine Reproductive and Respiratory Syndrome Virus (PRRSV): the Disease That Keeps Bugging Us
This paper gives an overview on the current PRRSv situation. The global distribution of PRRSv has changed, with new cases spreading over Africa, but Chile being close to eradicating the disease. There has also been a new recognition of the economic impact PRRSv has on finisher pigs. The impact is only expected to grow, as feed costs have risen and PRRSv can have a large impact on ADG and feed efficiency. As well, PRRSv can affect import and export of raw pork and live pigs. There have been advancements in prevention methods including biosecurity protocol for people and transport trucks, and air filtration system evaluations. Control of the virus involves developing herd immunity and depopulation, although a vaccine is available it is still not fully effective. The infection dose has been calculated for various transmission methods, and knowledge on transmission methods and virus tolerance have been increased. Research on transmission through aerosols is still ongoing. Diagnostic procedures for collecting samples have improved, and PCR diagnostics will continue to improve as well. Understanding PRRSv will help us identify, control, and eventually eliminate it from our herds.