Chikungunya virus (CHIKV) likely originated in Central/East Africa, where the virus has been found to circulate in a sylvatic cycle between forest-dwelling mosquitoes and nonhuman primates. In these areas, sporadic human cases occur, but large human outbreaks were not common. infected mosquitoes can then spread the virus to other people through bites. Chikungunya virus is most often spread to people by Aedes aegypti and Aedes albopictus mosquitoes. These are the same mosquitoes that transmit dengue virus. They bite during the day and at night.