Fig 1. Diagram of the study population.

“Unable”: patients unable to answer the question “Do you feel completely recovered from CHIKV-infection, in other words, are you now free of joint pain, rigidity, or edema related to this infection?”; “missed visit”: not present at a specific time point; “lost to follow-up”: patients who missed all follow-up visits from M3 onwards; “death”: dead patients; “CCA”: patients with chronic chikungunya arthritis; “no CCA”: patients without chronic chikungunya arthritis.