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In 1988, the Consortium for Retroviral Serology Standardization (CRSS) made a quality control study*and sent 19 aliquots of one and the same serum specimen to 19 different USA reference laboratories. Results comparison has shown an incredible differences of the number of bands and of their intensity. Lundberg GD. Serological Diagnosis of Human Immunodeficiency Virus Infection by Western Blot Testing. JAMA 1988; 260:674-679











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