In addition, a subpanel of samples that were Ag-negative but IgM and/or IgG positive, either by traditional LASV antibody platform (USAMRIID) [Trad IgG, Trad IgM] or recombinant protein-based (Hemorrhagic Fever Virus Diagnostics Consortium) [r IgG, r IgM] ELISA, were analyzed as controls. The gene discussed is CD40LG; the disease is Fever.