Of the 246 laboratory-confirmed dengue patients whose samples were selected for this study, 181 (73.6%) were RT-PCR positive, 72 (29.3%) were NS1-ELISA positive, and 151 (61.4%) presented IgM-ELISA seroconversion between the acute- and convalescent-phase samples. The gene discussed is CD40LG; the disease is dengue disease.