abstract |
The present invention relates to chimeric viruses of Porcine Reproductive and Respiratory Syndrome (PRRS) virus, which are useful as vaccines. The PRRSV chimeric virus of the present invention has a higher degree of attenuation than its parent strain, thereby promoting the secretion of neutralizing antibodies, and at the same time, has low pathogenicity and high stability, thereby being useful as a vaccine for effectively preventing and treating PRRS diseases. |