CD40LG and dengue disease: In six of the febrile travellers, dengue fever was confirmed, in four of them by both quantitative (q) RT-PCR [3] or PCR [4] and DENV IgM and IgG antibody capture ELISA (Panbio, Brisbane, Australia), in one only by qRT-PCR, and in one only by positive dengue virus NS1 antigen (Panbio, Brisbane, Australia) and IgM and IgG serology (Table).