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A Dengue Fever IgM Antibody, ELISA test detects the presence of IgM antibodies against the dengue virus in the blood. IgM antibodies are produced early in the immune response to a dengue infection, typically appearing within 4-7 days after symptom onset. This test is crucial for diagnosing acute dengue infection and differentiating it from other febrile illnesses. A positive IgM result, in conjunction with clinical symptoms, strongly suggests an active dengue infection.