The present invention is concerned with a genetically modified live herpesvirus vaccine of which the live herpesviruses are not shed into the environment by a vaccinated animal. This can he achieved by deleting a gene encoding a gD homolog, such as gp50 of pseudorabies virus, and propagating this deletion mutant in a cell line expressing the gene product. The reduced shedding characteristic of such a vaccine is particularly advantageous in a vector vaccine. The present invention also concerns a quadruple mutant pseudorabies virus vaccine, and a live cell bound vaccine containing gp50 mutant pseudorabies virus and cells which do not complement the mutation.
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