Hemagglutination Inhibition

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Red blood cells
Virus
Antibody

The following animations demonstrate Hemagglutinin Inhibition tests when anti-virus antibody is present (no agglutination) and when it is not (agglutination).

High titer anti-virus Abs

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Low titer anti-virus Abs

Animation
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A lack of red cell agglutination means that antibodies bound to virus and inhibited the virus from agglutinating red cells. In other words, a high anti-virus antibody titer can successfully inhibit an agglutinating agent (virus).

Immunological Techniques
University of Arizona
douglas.lake@asu.edu