CD40LG and dengue disease: The prevalence of dengue fever varied for studies reporting serum IgG and IgM: Littoral (0.3% IgM, 61.4% IgG), North (0.1% IgM, 24.2% IgG), Centre (0% IgM, 9.8% IgG) in September 2006–December 2007; and Adamawa (4.6% IgM, 0.6% IgG) among febrile patients in October 2019–January 2020.