Chikungunya is an infection caused by the Chikungunya virus (CHIKV).[5][3] The disease was first identified in 1952 in Tanzania and named based on the Kimakonde words for "to become contorted".[3] Symptoms include fever and joint pain.[2] These typically occur two to twelve days after exposure.[3] Other symptoms may include headache, muscle pain, joint swelling, and a rash.[2] Symptoms usually improve within a week; however, occasionally the joint pain may last for months or years.[2][6] The risk of death is around 1 in 1,000.[4] The very young, old, and those with other health problems are at risk of more severe disease.[2]