 This nucleocapsid core is surrounded by a lipid envelope covered with glycoprotein spikes and virion particles are approximately 70 nm in diameter in total .BBKV was first isolated in Babanki in Northwest Cameroon, Africa in 1969 and the disease is also known in Senegal and Madagascar .It is closely related to another "Alphavirus", Sindbis virus and causes similar symptoms in humans like fever, arthralgia or joint pain and a rash.