ELISA Test for HIV | A Level Biology 

This video explains how antibodies are used to test for HIV.
ELISA stands for Enzyme-Linked Immunosorbent Assay - the final result is determined by a colour change caused by an enzyme-controlled reaction.
ELISA tests are used to test for a wide range of allergens, antibodies, antigens, hormones and other proteins - so it's worth understanding how they work.
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