Is part of the genus of Flaviviridae. This genus includes the West Nile virus, dengue virus, tick-borne encephalitis virus, yellow fever virus, Zika virus and several other viruses which may cause encephalitis, as well as insect-specific flaviviruses (ISFs) such as cell fusing agent virus (CFAV), Palm Creek virus (PCV), and Parramatta River virus (PaRV).
BSQV belongs to the group of Aroa virusses.
Most of these viruses are transmitted by the bite from an infected arthropod (mosquito or tick), and hence are classified as arboviruses. Other virus transmission routes for arboviruses include handling infected animal carcasses, blood transfusion, child birth and consumption of unpasteurised milk products.