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Bulletin No. 28 - Winter 2007
VirologyPorcine Reproductive and Respiratory Syndrome (PRRS)
PESCH S, FETZER C, OHLINGER VF
Do Lelystad virus like virus isolates represent EU strain based PRRS vaccine reisolates?
Proceedings of the 19th IPVS Congress, Copenhagen, Denmark, 2006 - Volume 1:60
The aim of this study was to investigate the origin of Lelystad virus-like (LV like) strains recently observed in European countries. The study was conducted between 1998 and 2005 on almost 46,000 samples. The samples were analysed with RT-nPCR, and the PRRS-EU type-positive samples were then studied in a vaccine-field virus differentiating PCR. Some of them were sequenced in ORF 5 and genetically analysed. LV like isolates appeared to be present since 2001. As the Porcilis® PRRS vaccine started to be commonly used in 2001, LV like isolates are most likely to be derived from this vaccine.
