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Updated: Feb 16, 2026

Vibrio cholerae: Model Organism to Study Bacterial Pathogenesis - Interview
Published on: May 28, 2007
A real-time multiplex PCR for the identification and typing of Vibrio cholerae
David R Greig1, Tadgh J Hickey2, Megan D Boxall3
1Gastrointestinal Bacteria Reference Unit, Public Health England, 61 Colindale Avenue, London NW9 5HT, UK.
Abstract:
We report the development and validation of a duo-triplex real-time polymerase chain reaction (PCR) for the rapid identification and typing of Vibrio cholerae. The PCR assay targets a species-specific toxR gene present in all strains of V. cholerae and used as a marker for the species wbeO1 and wbfO139, encoding the O1 and O139 somatic antigens, and ctxA, encoding cholera toxin (CT). The two tcpA variants associated with the classical and El-Tor biotypes are used to infer biotype. The assay was evaluated using 178 isolates comprising eight different Vibrio species, including 122 isolates of V. cholerae. The PCR results of 171/178 (96.1%) isolates were concordant with the serotyping, biotyping, and expected CT results. Variants of toxR (n=3), nonfunctional wbeO1 (n=1), and CT-negative isolates of V. cholerae O1 (n=3) were likely explanations for the mismatched results. This duo-triplex real-time PCR is a reproducible and robust assay for the rapid identification and typing of V. cholerae belonging to the highly pathogenic, pandemic lineages.
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