Subject and method: Serum samples of patients suspected with dengue fever were tested by quick kit Dengue Duo (Dengue NS1 Ag; IgM / IgG) of SD Bioline Company on the principle of immunochromatography allowing to detect the presence of NS1 antigen, IgM, IgG antibodies, dengue antivirus in the serum of patients with 4 serotyp of dengue virus in Advia 2120i, Beckman AU-5800 machine.