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Vibrio cholerae, the causative agent for cholera, expresses a toxin required for virulence consisting of two subunits: the pentameric cholera toxin B (CTB) and cholera toxin A (CTA). CTB is frequently used as an indicator of the presence of pathogenic V. cholerae and binds to the G M1 ganglioside on the surface of epithelial cells. To study V. cholerae virulence (CTB expression) in the presence...
A highly sensitive and specific assay method was developed for the detection of viable Escherichia coli as an indicator organism in water, using nucleic acid sequence-based amplification (NASBA) and electrochemiluminescence (ECL) analysis. Viable E. coli were identified via a 200-nt-long target sequence from mRNA (clpB) coding for a heat shock protein. In the detection assay, a heat shock was applied...
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