Figure 1

Sites of collection of the BTV genomes analysed in this study. The geographical boundaries of the northern (red) and eastern (blue) Australian episystems are shown along with the location of the samples sequenced in this study. Samples from the northern Australian episystem are shown in red, those from the eastern episystem in blue, and those from Indonesia are indicated in orange. The number of isolates is indicated by the size of circle at each location. The epidemiologically predicted island dispersal area for BTV-infected Culicoides entering Australia is indicated by a black polygon.