From that North American whitetail article.
"
Although the first reports of HD involved the EHDV-1 serotype, the most reported infections today are from EHDV-2 (1999) and EHDV-6 (2006). This hybrid serotype is also called the “Indiana strain,” now considered an exotic serotype originating from Australia.
EHDV-6 was first reported in cattle in Illinois, and it likely came to the U.S. from the Caribbean and South America (the infected Caribbean cattle would’ve originally been infected by the Australian cattle). It is called the Indiana strain because this novel reassortant strain of EHDV-6 first occurred in whitetails in Indiana. The Indiana strain now kills large numbers of deer in the Midwest."
Explains allot.