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A Dengue Fever IgG Antibody, EIA test detects the presence of IgG antibodies against the dengue virus in your blood. These antibodies typically appear later in the course of the infection, usually after about a week, and can persist for several years. A positive IgG result indicates a past dengue infection, suggesting immunity to the specific dengue serotype. This test is often used in conjunction with the IgM antibody test to differentiate between recent and past infections.