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Enzyme-linked immunosorbent assay for Clostridium difficile toxin A.

D M Lyerly, N M Sullivan, T D Wilkins

Journal of Clinical Microbiology

|January 1, 1983

Summary

Researchers developed a specific assay to detect Clostridium difficile toxin A. This method accurately quantifies toxin A in samples, aiding in the diagnosis of C. difficile colitis.

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Area of Science:

Microbiology
Immunology
Biochemistry

Background:

Clostridium difficile is a significant cause of antibiotic-associated colitis.
Toxin A is a primary virulence factor produced by C. difficile.
Accurate detection of toxin A is crucial for diagnosing and managing C. difficile infections.

Purpose of the Study:

To develop and validate a highly specific method for detecting Clostridium difficile toxin A.
To quantify toxin A levels in C. difficile cultures and clinical specimens.
To confirm the presence of toxin A during C. difficile-associated colitis.

Main Methods:

Purification of antibodies against Clostridium difficile toxin A using affinity chromatography.
Characterization of antibody specificity via crossed immunoelectrophoresis.
Development of an indirect enzyme-linked immunosorbent assay (ELISA) for toxin A detection.
Quantification of toxin A in culture supernatants and human fecal samples.

Main Results:

Affinity-purified antibodies specifically neutralized C. difficile toxin A.
An indirect ELISA was established, capable of detecting as little as 1 ng of toxin A.
ELISA quantification of toxin A correlated well with cytotoxic titers for toxins A and B.
Toxin A was detected in fecal specimens from patients with antibiotic-associated colitis.

Conclusions:

A specific and sensitive ELISA for Clostridium difficile toxin A has been successfully developed.
This ELISA method is valuable for quantifying toxin A and aids in diagnosing C. difficile-associated colitis.
The findings confirm the production of toxin A during C. difficile colitis in humans.

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