Investigation of the epidemiology of PRRS
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Investigation of the epidemiology of PRRS in England to provide a basis for surveillance and control programmes
Research partners:
The Royal Veterinary College (RVC) and the Veterinary Laboratories Agency (VLA)
Sponsors: BPEX
Duration: 2009 – 2011
Given the huge economic impact of PRRS, surveillance and control measures need to be targeted and cost-effective. Better understanding of the current situation and the epidemiology of PRRS in the UK is needed in order to design appropriate control programmes. A good surveillance system is necessary for early detection of introduction into a herd, successful control and eventual eradication. The objective of this study is to provide a basis for the development of an adequate PRRS surveillance strategy.
Data and blood samples collected from 148 farms during 2008-2009 in the context of a cross-sectional study on PMWS were used to determine the prevalence of PRRSV infection in England at animal and herd level and then to identify the risk factors for active PRRSV infection at herd level.
In 40.28% of all farms at least one growing or finishing pig tested positive for PRRS, indicating recent circulation of the virus on the farm. Regular vaccination for PRRS seems to be common with 43.45% of farms reporting PRRS vaccination. From the PRRS vaccinating farms, the majority were using a live type vaccine, Porcilis PRRS. Other vaccines used were the inactivated vaccines Ingelvac PRRS KV and Progressis.
Preliminary results of risk factors indicate that the risk of PRRSV infection is associated with increased number of sites, herd size, dead pigs being collected, use of AI, presence of Swine Influenza virus and indoor production. Separation of boars at entry to the farm and increasing number of pig free days by visitors were identified as protective factors.
The outcomes of this project will provide an insight into the current PRRS situation in England and a basis to develop a surveillance system tailored to it, assisting control and/or eradication of PRRS.
Page last updated
04-Jan-2012