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　　ANALYSIS - Thirty years into Porcine Respiratory and Reproductive Syndrome (PRRS) in North America, the industry is confident it can get PRRSv out of herds predictably, but the challenge continues to be reinfection of the breeding herd, said Dr. Roger Main, director of the Veterinary Diagnostic Laboratory at Iowa State University.Looking at a PRRSv timeline: about 20 years ago the first modified live vaccine that was developed and introduced and is still in use today.About 15 years ago, PIC helped the industry understood how to eliminate PRRS from breeding herds cost effectively without depopulation, using a tool or management practice called herd closure.Over the last 10 years, research has focused on PRRSv routes of transmission.

　　愛(ài)荷華州立大學(xué)獸醫(yī)診斷實(shí)驗(yàn)室Roger Main博士說(shuō)道，自北美有豬呼吸與繁殖綜合征(PRRS)以來(lái)的三十年中，養(yǎng)殖業(yè)向來(lái)彌漫自信的預(yù)計(jì)，畜群會(huì)在未來(lái)怨碼豬呼吸與繁殖綜合征病毒(PRRSv)，但實(shí)際育種畜群卻不斷受到二次感染，挑戰(zhàn)依然存在。讓我們看下豬呼吸與繁殖綜合征的發(fā)展：20年前開(kāi)辟出首席款弱毒活疫苗，并向來(lái)被沿用至今。而過(guò)去15年間，PIC公司幫助行業(yè)認(rèn)識(shí)到，如何有效的消除育種畜群中的豬呼吸與繁殖綜合征病毒，以此節(jié)省成本而不是所有撲殺，并使用封鎖化畜群養(yǎng)殖管理。近10年來(lái)，研究的中央主要在豬呼吸與繁殖綜合征病毒的傳播途徑上。