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.

　　爱荷华州立大学兽医诊断实验室Roger Main博士说道，自北美有猪呼吸与繁殖综合征(PRRS)以来的三十年中，养殖业向来弥漫自信的预计，畜群会在未来怨码猪呼吸与繁殖综合征病毒(PRRSv)，但实际育种畜群却不断受到二次感染，挑战依然存在。让我们看下猪呼吸与繁殖综合征的发展：20年前开辟出首席款弱毒活疫苗，并向来被沿用至今。而过去15年间，PIC公司帮助行业认识到，如何有效的消除育种畜群中的猪呼吸与繁殖综合征病毒，以此节省成本而不是所有扑杀，并使用封锁化畜群养殖管理。近10年来，研究的中央主要在猪呼吸与繁殖综合征病毒的传播途径上。