abstract |
The present invention is concerned with European strains of the Porcine ReproductivenRespiratory Syndrome (PRRS) virus, having as a unique feature that they are non-infectiousnto macrophages, and to methods for the production of such strains. The inventionnalso provides vaccines for the protection of pigs against PRRS, based on thesenstrains, as well as methods for the production of such vaccines. |