Geographically, this virus is found in the Rocky Mountains of the United States and Canada. It is an arbovirus, and its vector is the wood tick Dermacentor andersoni . After an incubation period of about four days, the disease is characterized by a sudden onset, including fever, retroorbital pain, myalgia in the legs and back, and leukopenia. Seen mainly in China, Banna virus is associated with febrile illness and encephalitis. It is not known yet what the vector is, but it is an arbovirus and ticks and mosquitoes are candidates.
Zoonotic transmission is also a possibility.
Found in tropical Africa, Orungo is transmitted by a mosquito vector. There is not a great deal of information known about the virus, but infection appears to be fairly widespread although often subclinical or very mild. It is associated with febrile illness. It has been seen in Nigeria, and is linked to several different mosquitoes as possible vectors as well as a rodent. Associated with febrile illness in Panama, the incidence and distribution of Changuinola is unknown.