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Microbiology, 2021

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20.2 • Detecting Antigen-Antibody Complexes 821<br />

Figure 20.14 The complement fixation test is used to determine whether a patient’s serum contains antibodies to a specific antigen. If it<br />

does, complement fixation will occur, and there will be no complement available to lyse the antibody-bound sheep red blood cells that are<br />

added to the solution in the next step. If the sample does not contain antibodies to the antigen, hemolysis of the sheep blood cells will be<br />

observed.

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