Summary The laboratory diagnosis of dengue can be carried out using several approaches for the detection of the virus, viral RNA, antigens or specific antibodies, or even a combination of these methods. In many scenarios, such as patient care, surveillance, outbreak and epidemics investigations, vaccine trials and differential diagnosis, an accurate diagnosis is of great importance. However, the choice of method or test will not only depend on the goal of the testing but also on factors such as the laboratory infrastructure, technical expertise available, sampling collection, shipment and storage conditions. The desirable window for diagnosing dengue infection relies on the period of the onset of fever (acute phase) when the viremia occurs until the tenth day after (convalescent phase) when anti-dengue antibodies can be detected. Depending on which phase, specific diagnosis can be made; however, those techniques generally performed for direct viral detection, despite being more specific, are the least available. ELISA, used to detect IgM and convalescent IgG antibodies, as well as for the detection of nonstructural protein 1 (NS1) antigen, has been considered the most useful method for diagnosing dengue, due to its sensitivity, easier performance and low costs. Many in-house protocols have been established; however, the increased burden of the disease has led to the development of a variety of dengue diagnosis commercial tests in different formats (ELISA and rapid diagnostic test). Most of the time these are fast and easy to perform, but are not often fairly evaluated.
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