Viruses with diverse sequences can be found within the same geographic area; closely related viruses have been isolated from widely separated regions, suggesting that viral dispersion has occurred possibly by ticks carried on migratory birds or through international livestock trade.
Viruses with diverse sequences can be found within the same geographic area. Closely related viruses have been isolated from widely separated regions. Viral dispersion has occurred possibly by ticks. These ticks are carried on migratory birds or through international livestock trade. Closely related viruses were suggesting this.