Discussion
Which of the following is not depicting antigen-antibody reaction ?
Answer: B
The key's answer is ELISA.
Neutralization, precipitation and agglutination are the classical types of antigen-antibody reaction: an antibody neutralises a toxin or virus, links soluble antigens into a visible precipitate, or clumps particulate antigens such as red cells.
ELISA (enzyme-linked immunosorbent assay) is a laboratory technique that uses an antigen-antibody binding step and an enzyme label to measure an antigen or antibody. It relies on the reaction but is an assay method rather than one of the kinds of reaction, which is the distinction the question draws.
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