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Journal of Clinical Microbiology logoLink to Journal of Clinical Microbiology
. 1992 Oct;30(10):2705–2708. doi: 10.1128/jcm.30.10.2705-2708.1992

Purification of listeriolysin O and development of an immunoassay for diagnosis of listeric infections in sheep.

J C Low 1, R C Davies 1, W Donachie 1
PMCID: PMC270502  PMID: 1400971

Abstract

A protein of 58,000-Da molecular mass was purified from the supernatant fluid of a dialysis sac culture of Listeria monocytogenes by cation-exchange chromatography. The purified protein, homogeneous by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and possessing the characteristics of listeriolysin O (LLO), was used to develop an indirect enzyme-linked immunosorbent assay. Anti-LLO antibodies were shown to be consistently produced in sheep after experimental challenge with L. monocytogenes serovar 4b. The assay also successfully detected and measured specific anti-LLO antibodies in the sera of silage-fed sheep among which listeric enteritis and abortions had occurred.

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Selected References

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