CD40LG and dengue disease: Our study found that at a cut-off value of 1.45%, HFLC was able to differentiate dengue from other febrile illnesses with sensitivity and specificity of 47.0% and 87.8%, but if we analyze HFLC in the positive NS1 and IgM dengue groups separately, HFLC was not statistically significant in the positive NS1 group but had higher sensitivity and specificity in the positive IgM dengue group.