BWamba virus is a member of the Bunyaviridae family, genus Bunyavirus. This is one of the most dangerous and widespread viruses in the world. It causes a disease called Bwamba fever, also known as Fifinavirus or BWI. This infection is most often transmitted by airborne droplets. Infection with Bwamba virus usually occurs through the bite of an infected Aedes mosquito. **Epidemiology of infection and clinical course** The peak incidence of virus B occurs from March to August, when mosquito eggs are laid. Females bite people as soon as the air warms up to +25C, which corresponds to the number of hemicycles of eggs. The time from egg laying to mosquito bites is less than a week. Dangerous places in nature include lawns, flooded fields, river valleys, and areas of the country frequently visited by tourists. In the Limpopo River basin, there were cases of the disease in October due to mosquito breeding during the rainy season. The mechanism of transmission of infection is a skin bite (usually a female human, less often a male). The highest incidence is in children from 3 to 6 years old. No cases of infection have been reported in humans. The described epizootics are geographically isolated. Several cases of the disease have been reported among travelers, however, this is not related to geography.