Figure 3

Genome segment sharing between Indonesian and northern Australian BTV isolates. Year(s) of circulation are shown in parentheses and presumed reassortment events are indicated with an arrow. A The replacement of the existing Australian BTV-1 lineage from 1989 to 1993 (blue blocks) with segments circulating in concurrent Indonesian viruses (red blocks) is shown. B The introduction of BTV-2 into Australia and subsequent reassortment with BTV-1 viruses is shown. BTV-2 segments also circulating in concurrent Indonesian BTVs are indicated in red, segments unrelated to others in our dataset are shown in yellow, and pre-existing Australian BTV-1 segments are indicated in blue.