Diagnostic Techniques for Dengue Virus.

Dengue is a mosquito-borne viral disease that poses a global public health problem, particularly in tropical and subtropical regions. It is caused by the dengue virus (DENV), which comprises four antigenically distinct serotypes. The clinical manifestations of the disease overlap with those of other febrile diseases, including other arboviruses such as Zika and chikungunya, making clinical and epidemiological diagnosis difficult. Therefore, an accurate laboratory diagnosis is essential for effective clinical management, especially during the early stages of the disease, to prevent progression to severe forms.Over the years, significant advancements have been achieved in dengue diagnostics. This chapter provides a comprehensive overview of current diagnostic techniques, detailing their principles, applications, and limitations. It covers a range of methodologies, including virus isolation, nucleic acid amplification tests (NAATs), nonstructural protein 1 (NS1) antigen detection assays, immunohistochemistry, serological tests for IgM and IgG antibodies, and lateral flow point-of-care tests. Additionally, novel approaches such as multiplex platforms, next-generation sequencing (NGS), and biosensor-based tests are explored for their potential to address existing challenges and improve diagnostic accuracy.The choice of diagnostic strategy largely depends on the time course of infection and the available methodologies, resources, infrastructure, and technical expertise. Furthermore, the high degree of cross-reactivity between flaviviruses makes diagnosis by serological assays difficult, particularly in regions where multiple flaviviruses co-circulate. Dengue vaccination is also expected to influence the results of serological assays, requiring adjustments to algorithms and careful interpretation of results. By tailoring diagnostic approaches to local capabilities and accounting for the effects of vaccination, dengue diagnosis, and disease management can be improved.