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Multilocus variable-number tandem repeat analysis of Vibrio cholerae O1 El Tor strains harbouring classical toxin B.

Choi, Seon Young; Lee, Je Hee; Jeon, Yoon-Seong; Lee, Hye Ri; Kim, Eun Jin; Ansaruzzaman, M; Bhuiyan, Nurul A; Endtz, Hubert P; Niyogi, S K; Sarkar, B L; Nair, G Balakrish; Nguyen, Binh Minh; Hien, Nguyen Tran; Czerkinsky, Cecil; Clemens, John D; Chun, Jongsik; Kim, Dong Wook.
J Med Microbiol ; 59(Pt 7): 763-9, 2010 Jul.
Artigo Inglês | MEDLINE | ID: mdl-20299504
Atypical Vibrio cholerae O1 strains - hybrid strains (strains that cannot be classified either as El Tor or classical biotype) and altered strains (El Tor biotype strains that produce classical cholera toxin) - are currently prevalent in Asia and Africa. A total of 74 hybrid and altered strains that harboured classical cholera toxin were investigated by multilocus variable-number tandem repeat analysis (MLVA). The results showed that the hybrid/altered strains could be categorized into three groups and that they were distant from the El Tor strain responsible for the seventh cholera pandemic. Hybrid/altered strains with a tandem repeat of the classical CTX prophage on the small chromosome were divided into two MLVA groups (group I: Mozambique/Bangladesh group; group III: Vietnam group), and altered strains with the RS1-CTX prophage containing the El Tor type rstR and classical ctxB on the large chromosome were placed in two MLVA groups (group II: India/Bangladesh group; group III: India/Vietnam group).