| restriction endonuclease analysis of aujeszky's disease (pseudorabies) virus dna: comparison of northern ireland isolates and isolates from other countries. | aujeszky's disease (ad; pseudorabies) viruses isolated in northern ireland over a 20 year period were compared with isolates from other parts of the world using restriction endonuclease analysis of virus dna. when the numbers of bam h1, kpn 1 and sal 1 restriction sites were considered, pathogenic northern ireland isolates resembled viruses isolated in england, hungary and the u.s.a. and could be differentiated from viruses isolated in denmark, belgium and the netherlands. the avirulent northern ... | 1985 | 2998299 |