Inclusion Criteria:  Patients previously included in the RHUMATOCHIK study (N=307), or diagnosed as Chikungunya-related Rheumatoid Arthritis (N=21) after telephonic screening and given their oral consent Chikungunya infection (positive serology and/or evocative symptoms in the epidemic context)  Exclusion Criteria:  Impossible informed consent (cognitive impairment,…). Lost-to-follow-up patients, refusal to participate. -Pre-existing chronic inflammatory rheumatic disease (prior to CHIKV infection)-