Figure 1.

Study flow diagram. A chikungunya virus (CHIKV) epidemic occurred in 2014–2015 in the Atlántico Department of Colombia. Of the 2517 affected cases at study enrollment, 500 clinically confirmed cases were referred for the study, of which 485 participated in a followup telephone survey a median of 20 months after infection. Within this group, 123 patients reported having persistent joint pain, of whom 120 were subsequently interviewed by telephone a median of 40 months after infection, and 82 of whom also visited in person.