For which of the following tests is a lack of agglutination a positive reaction?

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Study for the Stevens Immunology-Serology Test. Explore flashcards and multiple choice questions with detailed explanations and hints. Get exam ready now!

Multiple Choice

For which of the following tests is a lack of agglutination a positive reaction?

Explanation:
In an agglutination inhibition assay, the positive signal comes from the absence of clumping. The test is designed so that when the target antigen is present, it binds to the reagent antibody and blocks cross-linking between particles. That prevents agglutination from occurring, so no visible clumping is interpreted as a positive result. In contrast, direct agglutination tests rely on visible clumping as the positive signal, so their positive reaction is not a lack of agglutination.

In an agglutination inhibition assay, the positive signal comes from the absence of clumping. The test is designed so that when the target antigen is present, it binds to the reagent antibody and blocks cross-linking between particles. That prevents agglutination from occurring, so no visible clumping is interpreted as a positive result. In contrast, direct agglutination tests rely on visible clumping as the positive signal, so their positive reaction is not a lack of agglutination.

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