CD40LG and dengue disease: A study conducted by Demanou et al. in 2006/2007 based on the detection of anti-dengue IgM and IgG in three main towns of Cameroon, showed a seroprevalence of 61.4% IgG and 0.3% IgM in Douala; 24.2% IgG and 0.1% IgM in Garoua and 9.8% IgG and no IgM in Yaoundé [14].