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Bulletin No. 19 - Fall 2004
18th IPVS Congress, Hamburg, Germany, 2004Porcine Reproductive and Respiratory Syndrome (PRRS)
STANKEVICIUS A, STADEJEK T, PEJSAK Z
Circulation of two genotypes of PRRSV within swine herd in Lithuania
Proceedings of the 18th IPVS Congress, Hamburg, Germany, 2004 - Volume 1:41
PRRSV is now widely spread in Lithuania with both European (EU) and American (US) strains circulating in swine herds. Lung samples from 2-3 month-old piglets with respiratory distress and blood samples from sows with reproductive failure were collected in a PRRS-affected farrow-to-finish farm which vaccinated sows with Ingelvac® PRRS modified live vaccine (Boehringer Ingelheim), and investigated by RT-nPCR and nucleotide sequencing. In 23.7% of the lung samples both EU and US PRRSV were identified. All sow serum samples were PRRSV negative. The US ORF5 sequence detected in piglets showed a high degree of similarity with Ingelvac® PRRS MLV and it was stated that the vaccine virus had spread from vaccinated sows to non-vaccinated piglets. The results of this study also demonstrates the lack of cross-protection provided by the vaccine since the presence of both EU and US strains was detected in piglets.
