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Tests detect how HIV disease works

How do antibody-based tests detect how HIV disease works?

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After the infection by HIV the immune system starts the production of antibodies (primary immune response) against virus. The tests ELISA (enzyme-linked immune-sorbent assay) and Western-blot search for presence of particular antibodies against HIV antigens in blood samples. Because only one positive ELISA is not conclusive, as false positive tests might happen, the Western-blot test is frequently employed after the positive ELISA.

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