| abstract |
The present invention relates to a mutant strain of porcine reproductive and respiratory syndrome virus (PRRSV) having increased stability; a composition comprising a virus strain or an antigen derived therefrom; a vaccine containing the virus strain, including inactivation, attenuation or secondary Unit vaccine; a nucleic acid encoding a PRRSV polypeptide, a polypeptide encoded by the nucleic acid, including an antigenic fragment thereof; an antibody that specifically binds to the polypeptide, and methods of making and using the same. |