Figure 1.

Neighbor joining phylogenetic tree constructed using the subcore shell protein (T2 protein) of orbiviruses. The T2 protein of tick-borne and mosquito-borne orbiviruses (green group) is the VP2, while in midge-borne orbiviruses (yellow group) the T2 is VP3. SCRV (red) roots all known orbivirus T2 proteins and represents the ancestral lineage (Attoui et al., 2001). The tree was constructed using the P-distance algorithm implemented in the MEGA5 programme. The scale bar indicates the number of substitutions per site. Values at the nodes indicate bootstrap confidence.