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Clonal Dissemination of a Single Vibrio cholerae O1 Biotype El Tor Strain in Sistan–Baluchestan Province of Iran During 2013

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Abstract

Although much is known about the mechanisms affecting cholera spread, cholera outbreaks occur annually in Iran. The aim of this study was to characterize and assess the clonal correlation of strains obtained from an outbreak in 2013 in Iran. Thirty-three strains of Vibrio cholerae were isolated from stool sample of patients majority of them belonged to Afghan nationality. PCR and sequencing analysis was performed to characterize virulence and resistance associates genes and cassettes. Clonality of isolates was assessed by Pulsed-field gel electrophoresis (PFGE) method. The ctx, zot, and tcp genes were present in 100 % of isolates. The wbeT gene was absent in all V. cholerae outbreak isolates, integrity of which is essential for Ogawa phenotype. This correlates with Inaba phenotype of all isolates under study. Sequencing of the ctxB + strains revealed that all isolates (El Tor strains) possessed the ctxB sequence of classical biotype allele known as El Tor variant strains. No class 1 or 2 integrons were detected among the isolates which indicate that in spite of high rate of resistance, integrons do not play an important role in V. cholerae resistance. All isolates were chloramphenicol sensitive all of which showed resistance to tetracycline and harbored the tetB resistance gene. PFGE analysis showed identical pulsotypes indicative of clonal dissemination of a single V. cholerae strain among the patients under study. Clonal cholera outbreak in boarder cities is alarming due to fear of import and spread of V. cholerae strains from out of the country which may lead to more spreading epidemics.

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Acknowledgments

This study was supported by a Grant from Research council of Tarbiat Modares University.

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Authors and Affiliations

  1. Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran

    Bita Bakhshi & Azam Mahmoudi-Aznaveh

  2. Infectious Diseases and Tropical Medicine Research Center, Zahedan University of Medical Sciences, Zahedan, Iran

    Ali Salimi-Khorashad

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  1. Bita Bakhshi
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  2. Azam Mahmoudi-Aznaveh
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Correspondence to Bita Bakhshi.

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Bakhshi, B., Mahmoudi-Aznaveh, A. & Salimi-Khorashad, A. Clonal Dissemination of a Single Vibrio cholerae O1 Biotype El Tor Strain in Sistan–Baluchestan Province of Iran During 2013. Curr Microbiol 71, 163–169 (2015). https://doi.org/10.1007/s00284-015-0806-x

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