Stichting Voor De Technische Wetenschappen

Maria Madalene Van Zijl

Antonius J Berns

Arnold Leonard Gielkens

Niels De Wind

The invention relates to a pseudorabies virus (PRV) not found in nature and having a genome containing a mutation in the protein kinase gene region and/or in the 28K gene region. The mutation is e.g. a nucleic acid substitution, deletion, insertion or inversion, or a combination thereof. The mutations are introduced, by genetic engineering techniques, into the genome of a naturally occuring PRV, preferably NIA-3. Insertions may be nucleic acid sequences encoding antigenic polypeptides characteristic of a pathogen found in pigs. The invention also relates to vaccines containing a pseudorabies virus according to the invention, and to a process for preparing such vaccines.

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Utrecht, Netherlands

Maria Madalene Van Zijl