A positive enzyme immunoassay (EIA) result is indicated by a color change, occurring when a substrate reacts with the enzyme attached to antibodies bound to trapped viral antigens. A negative result displays no color change because the unbound antibody-enzyme conjugate is washed away before substrate addition.

Enzyme Immunoassay Test Outcomes

The mechanism of an enzyme immunoassay (EIA) involves conjugating a colorless enzyme tag to a detecting antibody. When the antibody binds to a target antigen (often immobilized on a membrane filter) and unbound antibodies are washed away, the enzyme interacts with an added colorless substrate to produce a colored end product.

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An enzyme immunoassay (EIA) is a diagnostic test that utilizes the specific binding of antibodies to detect and attach to target antigens within a complex mixture of biomolecules.

Enzyme Immunoassay

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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Mechanism of Enzyme Immunoassay

Enzyme immunoassays (EIAs) targeting viral antigens are commonly employed as preliminary screening tests. Due to their role as initial screens, positive results must be confirmed using assays with higher sensitivity, such as a Western blot or a nucleic acid amplification test (NAAT).

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