BSIP, BERANGER / SCIENCE PHOTO LIBRARY BSIP, BERANGER / SCIENCE PHOTO LIBRARY
AIDS test. View of rows of wells containing human serum in an ELISA (enzyme-linked immunosorbent assay) test for antibodies to the HIV virus. HIV (Human Immunodeficiency Virus) is the cause of AIDS (Acquired Immune Deficiency Syndrome). Here, a colour change has occurred in six of the wells. In the ELISA test, blood serum of the patient is added to burst T-cells of blood which have been infected with HIV. Viral antibodies in the serum of the patient bind to viral antigens from the T- cells. When labelled antihuman immunoglobulin is added, a colour change occurs (from clear to yellow) if HIV antibodies are present. This means a positive test for the AIDS virus.
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