CD40LG and dengue disease: To determine the analytic performance and reproducibility of commercially available NS1 antigen tests and newly available IgM anti-DENV RDTs and microplate ELISAs, a network of laboratories established by WHO/TDR and the PDVI developed specimen panels from dengue patients infected with all DENV serotypes from both the Asian and American continents, and with primary and secondary DENV infections.