Whenever a foreign cell or organism enters our system, the
healthy body commands it's immune system to fight off the intruder. Basically, the ELISA test is performed to confirm the presence of antigen or the presence of the antibody in a serum. This serum is placed in a well-contained bead that is coated with
human immunodeficiency virus or HIV proteins. If HIV antibodies are present, they will bind to the antigens in the bead.
Another substance is added that will turn yellow is such binding occurs. If the test is negative, it should taken again in six months. If the test is positive, it is taken again. Once the second test come back positive, a
Western Blot is performed.
