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Vibrio cholerae is the bacterium that causes cholera in humans. It belongs among the gamma subdivision of proteobacteria. There are two dominant strains, classic and El Tor. are in the O1 serogroup and both contain Inaba, Ogawa and Hikojima serotypes

It colonizes the gut, where it adheres to villous absorptive cells via filaments, and secretes a toxin, causing massive fluid and electrolyte loss by diarrhea.

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