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Phylogenetic tree of 54 V. cholerae isolates obtained from the ICDDR, B. Phylogeny is based solely on SNPs. Strain designations and the year of isolation are indicated at the tips of branches. All strains are of two serotypes, Inaba or Ogawa, and strains of the Inaba serotype are indicated by arrowheads next to strain designations. The scale bar indicates the nucleotide substitutions per site.
