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. 1983 Jan;17(1):72–78. doi: 10.1128/jcm.17.1.72-78.1983

Enzyme-linked immunosorbent assay for Clostridium difficile toxin A.

D M Lyerly, N M Sullivan, T D Wilkins
PMCID: PMC272577  PMID: 6338036

Abstract

Antibodies against Clostridium difficile toxin A were purified by affinity chromatography from antiserum prepared against crude C. difficile toxin preparations. The affinity-purified antibody preparation was free of detectable amounts of antibodies to other C. difficile antigens, as demonstrated by crossed immunoelectrophoresis, and specifically neutralized the cytotoxicity of toxin A. An indirect enzyme-linked immunosorbent assay (ELISA) was subsequently developed using the antibody preparation for the specific detection of toxin A. The ELISA, which could detect 1 ng (5 ng/ml) of toxin A, was used to quantitate the toxin in the culture supernatant fluids of strains of C. difficile. The ELISA values for toxin A closely correlated with the toxin A and B cytotoxic titers of the supernatant fluids. In addition, toxin A was detected by ELISA in human fecal specimens from persons with antibiotic-associated colitis, demonstrating that this toxin is produced during C. difficile colitis.

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Selected References

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