CD40LG and infection: Sensitivity and specificity testing for a) DENV RDT NS1 versus reference assay NS1, b) RDT anti-DENV IgM versus reference assay anti-DENV IgM, and c) DENV RDT NS1 and/or RDT anti-DENV IgM versus reference assay positive DENV infection (see text for details of diagnostic criteria).