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. 1986 Nov;24(5):744–748. doi: 10.1128/jcm.24.5.744-748.1986

GM1 erythroimmunoassay for detection and titration of Escherichia coli heat-labile enterotoxin.

Y Germani, E Bégaud, J L Guesdon, J P Moreau
PMCID: PMC269021  PMID: 3533985

Abstract

A GM1 ganglioside erythroimmunoassay for the detection of heat-labile Escherichia coli enterotoxin (LT) was developed for use in poorly equipped laboratories in developing countries. This assay is based on the immunological similarity between Vibrio cholerae toxin and LT and uses cholera toxin antiserum and sheep anti-rabbit immunoglobulin covalently coupled to sheep erythrocytes as conjugate. This assay has the following advantages over other currently available techniques: the reagents it uses are stable, in particular, tanned and sensitized sheep erythrocytes; GM1 ganglioside is commercially available; erythro-adsorption can be read with the naked eye; the test can be completed in 1 day; and as little as 4 ng of V. cholerae toxin or LT per ml can be detected accurately. The GM1 ganglioside erythroimmunoassay showed good quantitative and qualitative correlation with the Vero cell assay and the conventional GM1 enzyme-linked immunosorbent assay. The GM1 ganglioside erythroimmunoassay was somewhat less sensitive than the GM1 enzyme-linked immunosorbent assay but more sensitive than the Vero cell assay. Results obtained for 12 LT-positive and 138 LT-negative E. coli strains correlated with results obtained with GM1 enzyme-linked immunosorbent and Vero cell assays.

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Selected References

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