WHO Fact Sheet on Chikungunya
http://www.who.int/mediacentre/factsheets/fs327/en/
A key point to note from this fact sheet is that Chikungunya is not directly responsible for any deaths but it can contribute to deaths in older people with other complications.
Quote from the WHO fact sheet:
"Most patients recover fully, but in some cases joint pain may persist for several months, or even years. Occasional cases of eye, neurological and heart complications have been reported, as well as gastrointestinal complaints. Serious complications are not common, but in older people, the disease can contribute to the cause of death." more