antibodies - Antibodies which bind to the HIV antibody are added to the well. These contain a sepcific attached enzyme. The well is washed and if there are no HIV antibodies all of the secondary antibody will be removed too - A solution is added -->
to the well. It contains a substrate which will bind to the enzyme attached to the secondary antibody to produce a coloured product... showing that the primary HIV antigen must be present hence the patient is infected with HIV
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