Molecular epidemiology of classical swine fever in Thailand was studied by analysing the phylogenetic relationships between 20 Thai classical swine fever virus isolates and the world isolates. The results show that Thai isolates were clustered into three distinct genogroups. Ten isolates from 1991-95 form a new genogroup not reported previously. Nine isolates from 1988-93 are in the same genogroups as old US and European strains. The viruses of this group seem to have died out in Europe, but they still exist in Thailand. One isolate from 1995 is closely related to some Italian strains (c4D).
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