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Year : 2012  |  Volume : 30  |  Issue : 1  |  Page : 39-43

A rapid and reliable species-specific identification of clinical and environmental isolates of Vibrio cholerae using a three-test procedure and recA polymerase chain reaction

1 Department of Bacteriology, Pasteur Institute of Iran
2 Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
3 Faculty of Science, Health and Education, University of the Sunshine Coast, Queensland, Australia

Correspondence Address:
B Bakhshi
Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran

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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0255-0857.93027

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Purpose: Vibrio cholerae, the cause of cholera, is one of the leading causes of morbidity and mortality in many developing countries. Most laboratories initially rely on biochemical tests for a presumptive identification of these strains, followed by a polymerase chain reaction (PCR)-based method to confirm their identification. The aim of this study is to establish a rapid and reliable identification scheme for V. cholerae using a minimal, but highly specific number of biochemical tests and a PCR assay. Materials and Methods: We developed a species-specific PCR to identify V. cholerae, using a housekeeping gene recA, and used that to evaluate the sensitivity and specificity of 12 biochemical tests commonly used for screening and / or presumptive identification of V. cholerae in the clinical and environmental samples. Results: Here we introduced a combination of three biochemical tests, namely, sucrose fermentation, oxidase test, and growth in trypton broth containing 0% NaCl, as also the PCR of the recA gene, for rapid identification of V. cholerae isolates, with 100% sensitivity and specificity. The established method accurately identified a collection of 47 V. cholerae strains isolated from the clinical cases (n = 26) and surface waters (n = 21), while none of the 32 control strains belonging to different species were positive in this assay. Conclusion: The triple-test procedure introduced here is a simple and useful assay which can be adopted in cholera surveillance programs for efficient monitoring of V. cholerae in surface water and fecal samples.


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2004 - Indian Journal of Medical Microbiology
Published by Wolters Kluwer - Medknow

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