Several field isolates of the pseudorabies vins (PrV) obtained from ou
tbreaks on pig farms were examined by restriction fragment pattern (RF
P) analysis. DNA was digested using Bam HI and Kpn I enzymes. AN isola
tes provided similar Bam HI and Kpn I restriction patterns, with a sli
ght heterogeneity between them. These differences are a useful tool in
epizootological studies.