INDUCTION OF PROTECTIVE IMMUNITY AND NEUTRALIZING ANTIBODIES TO PSEUDORABIES VIRUS BY IMMUNIZATION OF ANTIIDIOTYPIC ANTIBODIES

Xenogenic anti-idiotypic antibodies (anti-Id) were prepared in rabbits against three murine neutralizing monoclonal antibodies (MAbs) directed to pseudorabies virus glycoproteins. These anti-Id were highly specific to idiotopes on the corresponding MAb molecules. Because the binding of MAb to the corresponding anti-Id was inhibited by the addition of viral envelope protein, these anti-Id seemed to contain a subpopulation of antibodies against the antigen-combining site (paratope) or the region related to the paratope of the MAb molecules. One of the anti-Id to a MAb directed against glycoprotein gp50 induced neutralizing antibodies to PrV. Mice immunized with the anti-Id were protected from lethal infection of PrV.