CD40LG and Dengue hemorrhagic fever: Using the definition of any of the 3 diagnostics assay (NS1, PCR or IgM) as positive for ‘laboratory confirmed’ dengue, the sensitivity and specificity of the trained medical research assistant in distinguishing dengue (includes both DHF and DF cases) from OFI at the time of interview was 87.3% and 64.3% respectively (Table 5).