Epidemiological Report : Outbreak of Cholera Caused by Vibrio cholerae O1 El Tor Variant Strain in Bihar, India

  • Koley Hemanta
    Division of Bacteriology, National Institute of Cholera and Enteric Diseases
  • Ray Nivedita
    Division of Bacteriology, National Institute of Cholera and Enteric Diseases
  • Chowdhury Goutam
    Division of Bacteriology, National Institute of Cholera and Enteric Diseases
  • Barman Soumik
    Division of Bacteriology, National Institute of Cholera and Enteric Diseases
  • Mitra Soma
    Division of Bacteriology, National Institute of Cholera and Enteric Diseases
  • Ramamurthy T.
    Division of Bacteriology, National Institute of Cholera and Enteric Diseases
  • Mukhopadhyay Asish K.
    Division of Bacteriology, National Institute of Cholera and Enteric Diseases
  • Sarkar B. L.
    Division of Phage, National Institute of Cholera and Enteric Diseases
  • Katyal Rakesh
    National Center for Disease Control, Division of Malariology & Coordination
  • Das Pradeep
    Rajendra Memorial Research Institute of Medical Science (ICMR)
  • Panda Samiran
    Division of Epidemiology, National Institute of Cholera and Enteric Diseases
  • Ghosh Subrata
    Division of Epidemiology, National Institute of Cholera and Enteric Diseases

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  • Outbreak of Cholera Caused by <i>Vibrio cholerae</i> O1 El Tor Variant Strain in Bihar, India

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An outbreak of cholera struck Bihar, an Indian state, in August 2008 following a massive flood. Here we report the phenotypic and genotypic characteristics of Vibrio cholerae strains isolated from patients with diarrhea. Rectal swabs were obtained from patients with diarrhea who were admitted to medical camps or the hospital, and the strains were biochemically and serologically characterized. V. cholerae was isolated from 21 (65.6%) of 32 rectal swabs. Serological studies revealed that all the 21 isolates belonged to V. cholerae O1 Ogawa. Mismatch amplification mutation assay (MAMA)-PCR showed that the isolates belonged to El Tor variant group, and pulsed-field gel electrophoresis (PFGE) proved that these isolates were of a different lineage than the conventional El Tor variant strains. These isolates were resistant to several drugs, including ampicillin, streptomycin, tetracycline, nalidixic acid, and furazolidone. The uniqueness of the current report arises from the fact that records of cholera in Bihar are availiable for the early 1960s but not for the next 4 decades. Moreover, the present study is the first to report a cholera outbreak in Bihar that was caused by an El Tor variant strain.

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