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Microbiology, 2021

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836 20 • Laboratory Analysis of the Immune Response<br />

Figure 20.25 The indirect ELISA is used to quantify antigen-specific antibodies in patient serum for disease diagnosis. Antigen from the<br />

suspected disease agent is attached to microtiter plates. The primary antibody comes from the patient’s serum, which is subsequently<br />

bound by the enzyme-conjugated secondary antibody. Measuring the production of end product allows us to detect or quantify the amount<br />

of antigen-specific antibody present in the patient’s serum.<br />

CHECK YOUR UNDERSTANDING<br />

• What is the purpose of the secondary antibody in a direct ELISA?<br />

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