Introduction of foreign strains of Suid herpesvirus 1 (Aujeszky's disease virus) documented by restriction fragment pattern (RFP) analysis.

Six isolates of Suid herpesvirus 1 (SHV-1) collected from clinical outbreaks of Aujeszky's disease (AD) in Jutland in January-February, 1985, were compared by restriction fragment pattern (RFP) analyses with older SHV-1 isolates from Jutland as well as with SHV-1 isolates from different parts of West Germany and Ireland. The RFP analysis indicated that the outbreaks were caused by SHV-1 isolates introduced from abroad.