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The ELISA (Enzyme-Linked Immunosorbent Assay) test is one of the most widely used laboratory methods for detecting HIV infection. It is based on the principle of antigen-antibody interaction. When a person is infected with HIV, their immune system produces specific antibodies against the virus. The ELISA test detects the presence of these antibodies in the ____ ________ _______ __________ ___ ___.
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