Characteristics of Chikungunya virus infection in patients with established rheumatoid arthritis

The aim of this study is to describe both clinical and treatment needs in six patients who had a previous diagnosis of rheumatoid arthritis (RA) and were infected with Chikungunya virus (CHIKV). We report RA patients who acquired CHIKV infection, treated from the Fundación Valle del Lili Hospital, Cali, Colombia, between August 2014 and September 2015. Data of demographic information, clinical and laboratory findings, DAS28 score, dose of glucocorticoids (GC), or conventional or DMARD use was collected before, during CHIKV infection, and 6 months of follow-up. Five women and one man were analyzed, with an average age of 66 years, who had been receiving low doses of GC (4 mg of prednisolone/day on average). Two patients were being treated with methotrexate (MTX) and etanercept, one with MTX and other with etanercept, with an average DAS28 of 2.00 at the last control consultation. At the time of CHIKV infection, they presented an average DAS28 of 3.98, requiring more than double their usual dose of GC (average dose 8.75 mg/day of prednisolone). One patient required a change from etanercept to adalimumab and three others started rituximab, tocilizumab, and tofacitinib as second-line medication. A case series of patients with RA in remission are presented, who when contracting CHIKV infection developed exacerbation of their underlying disease, which in general was difficult to control. An increase in the doses of GC and change or induction to the use of second-line medications (anti-TNF, anti-CD20, or Janus kinase inhibitor) were required.