A recent study in Brazil evaluated both the Inbios and Euroimmun IgM-ELISA kits for the diagnosis of chikungunya in cases that occurred from 2014 to 2016, when DENV, CHIKV and ZIKV circulated simultaneously and, among dengue cases, specificities were 83.9% and 82.8% for the acute-phase samples, and 88.9% and 83.3% for the convalescent-phase samples, respectively. The gene discussed is CD40LG; the disease is dengue disease.