Molecular Characterization Reveals Involvement of Altered El Tor Biotype Vibrio cholerae O1 Strains in Cholera Outbreak at Hyderabad, India

Ajay Kumar Goel; Meenu Jain; Pramod Kumar; Pennagaram Sarguna; Meera Bai; Neha Ghosh; Natrajan Gopalan

doi:10.1007/s12275-011-0317-9

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Molecular Characterization Reveals Involvement of Altered El Tor Biotype Vibrio cholerae O1 Strains in Cholera Outbreak at Hyderabad, India: Ajay Kumar Goel ¹, Meenu Jain ¹, Pramod Kumar ¹, Pennagaram Sarguna ², Meera Bai ², Neha Ghosh ¹, Natrajan Gopalan ¹; Journal of Microbiology 2011;49(2):280-284.
DOI: https://doi.org/10.1007/s12275-011-0317-9
Published online: May 3, 2011

¹Biotechnology Division, Defence Research & Development Establishment, Jhansi Road, Gwalior-474002, India, ²Sir Ronald Ross Institute of Tropical and Communicable Diseases, Hyderabad 500044, India¹Biotechnology Division, Defence Research & Development Establishment, Jhansi Road, Gwalior-474002, India, ²Sir Ronald Ross Institute of Tropical and Communicable Diseases, Hyderabad 500044, India

Corresponding author: Ajay Kumar Goel , Tel: +91‐751‐223‐3742,

Received: 16 August 2010 • Accepted: 22 November 2010

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Abstract

Thirty-four Vibrio cholerae isolates collected from a cholera outbreak in Hyderabad, South India were found to belong to serogroup O1 biotype El Tor serotype Ogawa. The genotype of all the isolates was confirmed by PCR assays. All the isolates were found PCR positive for ctxAB, ompW, rfbO1, rtxC, and tcpA genes. All the isolates but one harboured rstREl Tor allele. However, one isolate carried both rstREl Tor as well as rstRClassical alleles. Cholera toxin (ctxB) genotyping of the isolates confirmed the presence of altered cholera toxin B of classical biotype in all the isolates. All the isolates except VCH35 harboured an RS1-CTX prophage array on the large chromosome. The isolate VCH35 contained a tandem repeat of classical CTX prophage on the small chromosome. The clonal relationship among the V. cholerae isolates as carried out by enterobacterial repetitive intergenic consensus sequences PCR, BOX PCR and randomly amplified polymorphic DNA, uniformly showed a genetic relationship among the outbreak isolates. The results of this study suggest that altered El Tor biotype V. cholerae with the classical cholera toxin gene are involved in cholera outbreaks in India.

Keywords: cholera;Vibrio cholerae;outbreak;cholera toxin;biotype;CTX prophage

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Molecular Characterization Reveals Involvement of Altered El Tor Biotype Vibrio cholerae O1 Strains in Cholera Outbreak at Hyderabad, India

J. Microbiol. 2011;49(2):280-284. Published online May 3, 2011

DOI: https://doi.org/10.1007/s12275-011-0317-9

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