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A total of 148 Japanese isolates of pseudorabies virus (PrV) collected in 1987 to 1990 were examined for the cleavage patterns of their genomes by a restriction endonuclease (RE) assay using BamHI and KpnI. Basically, there was no large difference in the cleavage patterns of viruses recently isolated in Japan. All of them were considered as belonging to BamHI cleavage pattern type II as well as strain Yamagata-S81 that is the first isolate of PrV in Japan, suggesting that no remarkable variations occurred in PrVs spreading in Japan since the first outbreak in 1981. However, considerable variations that are probably due to the gain and/or loss of cleavage sites, and to the addition and/or deletion of nucleotide sequences were detected in the repeat, conjunction and left end regions of genome. Some of those variations were similar to one another among the viruses isolated in the same geographical areas or farms at the same times, and from the epidemiologically related outbreaks, indicating that the RE assay on PrV genome is one of useful tools for the epidemiological studies on Aujeszky's disease.

Characterization of Pseudorabies Viruses Recently Isolated in Japan by Restriction Endonuclease Assay.