[Updated on July 12] Integration of CiNii Articles into CiNii Research from April 1, 2022

Prevalence of Vibrio cholerae O1 El Tor variant in a cholera-endemic zone of Kenya

  • Suleiman M. Saidi
    Medical Sciences Department, Technical University of Mombasa, Mombasa, Kenya
  • Nityananda Chowdhury
    International Prevention of Epidemics, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan
  • Sharda P. Awasthi
    International Prevention of Epidemics, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan
  • Masahiro Asakura
    International Prevention of Epidemics, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan
  • Atsushi Hinenoya
    International Prevention of Epidemics, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan
  • Yoshio Iijima
    Kobe Institute of Health, Kobe, Japan
  • Shinji Yamasaki
    International Prevention of Epidemics, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan

Abstract

<jats:p>Since 2007, Kenya has experienced an increase in cholera outbreaks characterized by a high fatality rate. In this study, we characterized 81 <jats:italic>Vibrio cholerae</jats:italic> isolates from diarrhoeal stool samples in Nyanza, a cholera-endemic lake region of Kenya, for virulence properties, clonality and antibiotic susceptibility. Eighty of these isolates were <jats:italic>V. cholerae</jats:italic> O1 El Tor variants carrying the classical <jats:italic>ctxB</jats:italic> gene sequence, while one isolate was <jats:italic>V. cholerae</jats:italic> non-O1/O139. All of the El Tor variants were of clonal origin, as revealed by PFGE, and were susceptible to ampicillin, tetracycline, ciprofloxacin, fosfomycin, kanamycin and norfloxacin. However, the isolates showed resistance to sulfamethoxazole/trimethoprim and streptomycin, and intermediate resistance to nalidixic acid, chloramphenicol and imipenem. The non-O1/O139 isolate carried the cholix toxin II gene (<jats:italic>chxA</jats:italic> II) and was susceptible to all antimicrobials tested except ampicillin. We propose that an El Tor variant clone caused the Nyanza cholera outbreak of 2007–2008.</jats:p>

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