PRRS EFFECTIVE VACCINATION AGAINST PORCINE REPRODUCTIVE AND RESPIRATORY SYNDROME PRRS VIRUS PRIOR TO WEANING

摘要

The present invention provides isolated polynucleotide molecules comprising a DNA sequence encoding an infectious RNA sequence that encodes a genetically modified North American PRRS virus, methods of making such molecules and related polypeptides, polynucleotides and various components. Also provided are diagnostic kits that distinguish vaccines comprising genetically modified viruses and polynucleotides and animals vaccinated with naturally infected animals.