Chikungunya is a virus that is transmitted by mosquitoes to people. Mosquitoes become infected when they feed on a person infected with the virus and then spread it to other people through bites. It is most often spread to people by Aedes aegypti and Aedes albopictus mosquitoes. These are the same species that spread dengue virus. They bite mostly during the daytime. These mosquitoes have been found in many parts of the world. As of June 2014, these mosquito species have not yet been identified in Southern Nevada.