Method of attenuating porcine pseudorabies virus, attenuated strains of porcine pseudorabies virus, vaccine composition and use thereof

摘要

This invention provides a method of attenuating porcine pseudorabies virus, which can effectively and reproducibly attenuate porcine pseudorabies virus. The attenuated strain of porcine pseudorabies virus by use of said method can provide effective immunization for pigs.