At the Central Health Laboratory (CHL) in Mauritius, the patient’s serum was positive for immunoglobulin (Ig) G and IgM against dengue with the Hexagon Dengue rapid immunochromatography test (Human GmbH, Wiesbaden, Germany) and negative for Platelia dengue nonstructural protein 1 (Bio-Rad Laboratories, Marnes-la-Coquette, France). The gene discussed is CD40LG; the disease is dengue disease.