Study population : patients with confirmed CHIKV infection Sample size : panel of 20 CHIKV confirmed cases Data analysis and reporting : The percentages of positive urine RT-PCR (over different time-points of duration of the CHIKV infection) will be calculated. Proportions of positivity rates will be tested by χ²-test for equality of proportions. Ct-values between two different sample types (serum/urine) will be compared by calculation of Spearman's rank correlation coefficient (ρ). The Ct-values measured will be subtracted (indicated by ∆Ct) and the mean of all ∆Ct-values (± 95% confidence interval) will be calculated. Reporting in accordance with Standards for Reporting of Diagnostic Accuracy (STARD) guidelines.