Fig. 2.

Maximum likelihood analysis based on partial IPNV VP2 gene sequences. Finnish IPNV isolates are marked with a dotted curved line. Genogroups (Gg) are marked with a solid curved line. The number of isolates and the year of isolation of the Finnish isolates are given under each genogroup. The scale bar indicates the number of substitutions per site. Numbers at the nodes of the tree indicate bootstrap values; values higher than 70 are given. The GenBank accession numbers of previously published sequences used in the analysis are presented in the “Materials and methods”