CD40LG and dengue disease: There was a slight non-significant increase in the sensitivities of the IgM/NS1 and IgM/NS1/IgG combined dengue biomarkers in secondary dengue samples (98 %; 95 % CI: 89.5-99.7 and 98.6 %; 95 % CI: 92.9-99.8, respectively), over primary dengue samples (97.1 %; 95 % CI: 90.2-99.2 and 98.6 %; 95 % CI: 92.3-99.0, respectively).